440 PROCEEDINGS OF THE ACADEMY OF [MaV, 



by means of a neck and head and the posterior three having only 

 the tubercles; the terminal rib is very slender. 



The sternum consists of four segments showing no tendency, as 

 yet, toward ankylosis. The most anterior is concave above with 

 a well-defined median carina below; the three remaining segments 

 are flat with a median notch in both the anterior and posterior 

 borders. 



The sternum agrees well with that of the Massachusetts specimen 

 figured by Allen except that the first segment of the New Jersey 

 sternum is a little differently shaped and is much more deeply notched 

 than in the former. This difference has no significance. 



The scapula is widely fan-shaped, has a long, thin acromion curved 

 inward and slightly upward, and a straight narrow coracoid directed 

 somewhat upward and almost as long as the acromion. 



The scapula resembles that of Mesoplodon bidens figured in the 

 OsUographie des Cetaces, PI. XXII, fig. 2. 



Several of the phalanges from each manus have been lost and, 

 consequently, the correct formula cannot be given. 



Explanation of Plates XVI, XVII, and XVIII. 



Plate XVI. — Mesoplodon densirostris; drawing from nature by Mr. Henry W. 

 Fowler. 



Plate XVII. — Fig. 1. — Superior view of skull of M. densirostris. 

 Fig. 2. — Inferior view of skull of M. deyisirostris. 

 Fig. 3. — Lateral view of skull of M. densirostris. 



*e* 



Plate XVIII. — Fig. 1. — Sternum of M. densirostris. 

 Fig. 2. — Scapula of M. densirostris. 

 Fig. 3. — First lumbar vertebra of M. densirostris. 

 Fig. 4. — First three cervical vertebra; of M. densirostris. 

 Fig. 5. — First caudal vertebra of M. densirostris. 

 Fig. 6. — First dorsal vertebra of M. densirostris. 

 Fig. 7. — Right ramus of mandible of M. densirostris. 



