Plate 1 SKULLS OF MESOPLODON
Fig. 1. Mesoplodon bidens. Skull. Nantucket, Mass. Mus. Comp. Zoölogy, No. 1727. Female, adult. Dorsal aspect. About ¼ nat. size.
Extremity of beak defective.
2. Mesoplodon densirostris? Skull. Annisquam, Mass. Female, young. Boston Society of Natural History. Dorsal aspect. ¼ nat. size.
Defective on the left side.