BALENOPTERA PHYSALUS (L.), B. MUSCULUS (L.), AND B. VELIFERA COPE (?). Fig. 1.-B. physalus, Cape Cod, Mass., No. 16039 U. S. N. M. Figs. 2 and 4.-Ditto, No. 16045 U. S. N. M. Fig. 3.-B. velifera (?), California. Figs. 5, 9, 10.-B. musculus, Newfoundland. Figs. 6-8.-Ditto, Ocean City, N. J.

SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE, VOL. XXXIII.

FIG. 2.