BALENOPTERA ACUTO-ROSTRATA Lac.

London, England. (British Museum.)

1. Skeleton from South Greenland. (Flower.)

2. Stuffed specimen, very young, from Greenland. (Flower.)

Louvain, Belgium. (Museum of the University.)

1. Skeleton from Greenland. (Van Beneden.)

Stuttgart, Germany.

1. Skeleton from Labrador. (Van Beneden.)

Copenhagen, Denmark.

1. (Eschricht states that Holböll transmitted three skeletons from Greenland. Anat. Untersuch., p. 173.)

1. Skull from the mouth of the Maroni River, Dutch Guiana; stranded in 1877. (Van Beneden.)

Copenhagen, Denmark.

1. Skeleton of an immature individual from Greenland, 53 ft. (N.) long. (Lilljeborg.)

Copenhagen, Denmark.

BALÆNOPTERA MUSCULUS (L.).

1. Bones of a pectoral fin, from Baffin Bay; collected by Holböll. (Van Beneden.)

St. Petersburg, Russia.

1. Skeleton from the Arctic Ocean. Collected by Peter Kargin, 1740. (Pallas; Van Beneden.) This species.?

Vienna, Austria.

1. Baleen collected by Capt. Scammon. (Van Beneden.) This species. ?

RHACHIANECTES GLAUCUS Cope.

Vienna, Austria.

1. Baleen collected by Capt. Scammon. (Van Beneden.)

EXPLANATION OF PLATES.

PLATE 1.

FIGURE 1. Cranium of the type of Sibbaldius tectirostris Cope. Dorsal view.

Natural Sciences.

Philadelphia Academy of

FIGURE 2. Cranium of Balaenoptera physalus (L.). Dorsal view. No. 16045, U. S. National Museum. Cape
Cod, Mass. Collected by the U. S. Fish Commission.
FIGURE 3. Cranium of Balanoptera physalus (L.). Dorsal view.
Cod, Mass. Collected by the U. S. Fish Commission.

No. 16039, U. S. National Museum. Cape

PLATE 2.

FIGURE 1. Cranium of the type of Sibbaldius tectirostris Cope. Ventral view.
FIGURE 2. Cranium of Balaenoptera physalus (L.). Ventral view.
Cod, Mass.

No. 16045, U. S. National Museum. Cape

FIGURE 3. Cranium of Balanoptera physalus (L.). Ventral view. No. 16039, U. S. National Museum. Cape Cod, Mass.

PLATE 3.

FIGURE 1. Cranium of Balaenoptera physalus (L.). Dorsal view. Cape Cod, Mass. Ward's Natural Science Establishment, Rochester, N. Y.

FIGURE 3. Cranium of Balaenoptera physalus (L.). Lateral view. No. 16039, U. S. National Museum. Cape Cod, Mass.

FIGURE 4. Bones from the type-skeleton of Sibbaldius tectirostris Cope. Right first rib (double-headed), first lumbar, first dorsal, and axis.

PLATE 5.

FIGURE 1. Cervical and dorsal vertebræ of the type-skeleton of Sibbaldius tectirostris Cope.

FIGURE 2. Lumbar vertebræ of the same.

FIGURES 3 and 4. Caudal vertebræ of the same.

PLATE 6.

FIGURE 1. Ribs of the type-skeleton of Sibbaldius tectirostris Cope.

FIGURE 2. Left scapula and humerus of the same.

FIGURE 3. Right first rib of the same (double-headed).

FIGURE 4. Anterior portion of the skeleton of Balaenoptera velifera (?), from behind, showing the ribs, sternum, etc., in position. Coast of California. Wistar Institute, University of Pennsylvania.

PLATE 7.

FIGURE 1. Scapula of Balaenoptera physalus (L.) from skeleton No. 16039, U. S. National Museum. Cape Cod, Mass.

FIGURE 2. The same from skeleton No. 16045, U. S. National Museum. Cape Cod, Mass.

FIGURE 3. Scapula from skeleton of Balanoptera velijera (?) in Wistar Institute. Coast of California.
FIGURE 4. Sternum of Balanoptera physalus (L.) from skeleton No. 16045, U. S. National Museum.
FIGURE 5. Scapula of Balanoptera musculus (L.). Balena Station, Hermitage Bay, Newfoundland.
FIGURE 6. Scapula from skeleton of Balaenoptera musculus (L.). Ocean City, N. J. Philadelphia Academy
of Natural Sciences.

FIGURE 7. Radius and ulna from the same.

FIGURE 8. Humerus from the same.

FIGURE 9. Ulna of Balanoptera musculus (L.). Balena Station, Hermitage Bay, Newfoundland.
FIGURE 10. Nasals of the same.

PLATE 8.

FIGURE 1. Balænoptera physalus (L.). No. 79. Showing dark left lip and the pectoral ridges. (The dark line crossing the white ridges obliquely is due to slime from the surface of the water.)

FIGURE 2. The same species. No. 18.

FIGURE 3. The same species.

preceding specimens.

No. 93. Showing greater extension of dark color on the left side than in the

FIGURE 4. The same species. No. 13.

All specimens from Snook's Arm Station, Notre Dame Bay, Newfoundland.

PLATE 9.

FIGURE 1. Balaenoptera physalus (L.). No. 79. Ventral view.

FIGURE 2. The same species. No. 49. Ventral view, showing the enlarged mammary glands which appear as large rounded eminences immediately in front of the pudendum. FIGURE 3. The same species. No. 209. Ventral view, showing the white right lip.

FIGURE 4. The same species. No. 29. dark color.

Anterior portion of ventral surface, showing large extension of

corner of

FIGURE 5. The same species. No. 17. Dorsal view, showing right eye, auricular orifice, mouth," and pectoral.

All specimens from Snook's Arm Station, Notre Dame Bay, Newfoundland.

PLATE 10.

FIGURE 1. Balænoptera physalus (L.). No. 209. Head, showing white right mandible, anterior portion of upper jaw, and whalebone.

FIGURE 2. The same species. No. 9. Head, showing dark left jaws and whalebone. FIGURE 3. The same species. No. 178. Lateral view of anterior portion of body, showing white right mandible, and the peculiar markings above the eye and at the base of the pectoral. FIGURE 4. The same species. No. 189. Pudendum, mammary fossæ, and anus. a. clitoris, b. mammary fossæ, c. vestibule, d. anus, e. gray anal lines.

FIGURE 5. The same species. No. 9. Ventral view.

All specimens from Snook's Arm Station, Notre Dame Bay, Newfoundland.

PLATE 11.

FIGURE 1. Balaenoptera physalus (L.). No. 12. Dorsal view (head lying in the water). Showing the right white mandible, and the peculiar markings above the eye, auricular orifice, and base of pectoral. FIGURE 2. The same species. No. 13. Showing similar markings on the left side.

Head. Dorsal view.

Dorsal view.

FIGURE 3. The same species. No. 189.
FIGURE 4. The same species. No. 79.
FIGURE 5. The same species. No. 189.
FIGURE 6. The same species. No. 189.
(The mandible has not been removed).
All specimens from Snook's Arm Station, Notre Dame Bay, Newfoundland.

Dorsal fin. (The peculiar markings are due to abrasion by the cables.)
Showing the whalebone in position and the "roof of the mouth."

PLATE 12.

FIGURE 1. Balanoptera physalus (L.). Provincetown, Mass. Length reported as 65 ft. 4 in., and “the largest of the finback species ever taken here” (Provincetown).

FIGURE 2. The same specimen. Ventral view. (The flukes are an addition by the photographer.)
FIGURE 3. The same species. Showing the mouth. Provincetown, Mass.

FIGURE 4. Another view of the same specimen.

FIGURE 5. The same specimen as Figure 3, showing flukes, penis, etc.

FIGURE 6. Stripping a carcass of Balaenoptera physalus (L.) at Nantucket, Mass. Showing the white anterior right whalebone.

FIGURE 7. Flukes of Balanoptera physalus (L.), No. 26. Ventral surface. Snook's Arm Station, Notre Dame Bay, Newfoundland.

FIGURE 8. Flukes of Balanoptera physalus (L.), No. 258. Ventral surface.

Snook's Arm Station, Notre

Dame Bay, Newfoundland.

PLATE 13.

FIGURE 1. Balaenoptera musculus (L.), No. 2 ¿. Anterior portion of body. Dorsal view, showing broad head, light mottled color of shoulder, and white extremity of pectoral. FIGURE 2. The same species. No. 3. and pectoral.

Pectoral region, showing mottled coloration, auricular orifice, eye,

FIGURE 3. The same species. No. 239. Lateral view of anterior half of body.
FIGURE 4. The same species and specimen. Lateral view.

All specimens from Balena Station, Hermitage Bay, Newfoundland.

FIGURE 4. The same species. No. 23. Anterior view of head. The blowhole appears at the summit of the broad head, and the eyes at the lateral extremities. (The mandible is out of position and exaggerated in size.)

All specimens from Balena Station, Hermitage Bay, Newfoundland.

PLATE 16.

66

FIGURE 1. Balanoptera musculus (L.). No. 239. Right eye and corner of mouth."
FIGURE 2. Left eye of the same specimen.

FIGURE 3. The same species. No. 9 9. Whalebone and "roof of mouth."
FIGURE 4. The same species. No. 149. Left whalebone in position.

All specimens from Balena Station, Hermitage Bay, Newfoundland.

PLATE 17.

FIGURE 1. Balanoptera musculus (L.). No. 26. Ventral view, showing navel, pudendum, and scattered spots of light gray.

FIGURE 2. The same species, No. 20. Ventral view, showing a large amount of light color at the posterior ends of the abdominal ridges.

FIGURE 3. The same species, No. 26 (already shown in Figure 1). The dark coloration and paucity of spots are especially noticeable.

FIGURE 4. The same species, No. 20

(already shown in Figure 2). Shows the distinct white spots on the abdominal ridges and white area at base of pectoral.

Both specimens are from Balena Station, Hermitage Bay, Newfoundland,