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by Cope and Scammon; also numerous representations of the different individuals of the Common Finback and the Sulphurbottom, from photographs taken by the author at the Newfoundland whaling stations. The latter are of special value for the study of individual variation in these huge animals.

In accordance with the rule of the Institution this paper has been referred to a committee consisting of Doctor Theodore Gill, Associate in Zoology, United States National Museum, Doctor J. A. Allen, Curator of Mammalogy in the American Museum of Natural History, New York, and Doctor Leonhard Stejneger, Curator in the Department of Biology, United States National Museum.

S. P. LANGLEY,

SECRETARY,

Smithsonian Institution,

Washington, D. C., June, 1904.

LIST OF TEXT FIGURES.

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FIGURES 1 to 7. Dorsal Fin of Balanoptera physalus.
FIGURES 8 to 32. Sternum of Balænoptera physalus .
FIGURES 33 to 36. Scapula of Balænoptera physalus...
FIGURES 37 to 44. Dorsal Fin of Balænoptera musculus ,
FIGURES 45 to 48. Scapula of Balænoptera musculus..
FIGURES 49 to 50. Sternum of Balanoptera musculus.
FIGURES 51 to 52. Sketches of Balænoptera acuto-rostrata, by JOSEPH P. THOMPSON.
FIGURES 53 to 56, Scapula of Balanoptera acuto-rostrata....
FIGURES 57 to 66. Sternum of Balunoptera acuto-rostrata ..
FIGURE 67. Pectoral Fin of Balanoptera acuto-rostrata from Greenland.
FIGURES 68 to 72. Dorsal and Pectoral Fins of Megaptera nodosa..
FIGURES 73 to 78. Scapula of Megaptera nodosa.....
FIGURES 79 to 83. Sternum of Megaptera nodosa ..
FIGURE 84. Nasal Bone of Type-skull of Balaena cisarctica .
FIGURES 85 to 87. Sternum of Balæna glacialis.....
FIGURES 88 to 93. Scapula of Balæna glacialis ...
FIGURES 94 to 96. Skeleton of Balænoptera velifera (?), in the Wistar Institute, Philadelphia..
FIGURE 97. Scapula of the same

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For Explanation of Plates 1 to 50, see page 311.

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