3. The same. Right mandibular tooth. Inner surface.

All figures a little more than ⅗ nat. size.

[Illustration: Plate 13 SKELETON AND LUNGS OF MESOPLODON EUROPÆUS]

_Mesoplodon europæus._ Atlantic City, New Jersey. Cat. No. 23346,

U.S.N.M.

Fig. 1. Vertebræ, from right to left as follows: 7th thoracic, 8th

thoracic, 1st lumbar, 1st caudal. Scale, 1/3.7 nat. size.