NATURAL SCIENCES OF PHILADELPHIA. 31 



One of the chief peculiarities of this species, and that from which it derives 

 Its -name, is seen in the scapula. On placing the glenoid cavity in the same plane 

 with that of the scapula of the angustata, the acromion is observed to be 

 in the general plane of the scapula, and not deflected inward, and to be shorter 

 and much decurved. The coracoid is also decurved so as to be nearly parallel 

 with the acromion; the extremities of the two are connected by a strong liga- 

 ment. This direction of the coracoid is the opposite of what is seen in most 

 other Delphinidas, and all others of this genus, where it is recurved and acumi- 

 nate. 



The superior sinus, while more deeply incised than that of the augustata, 

 is much more open, having divergent, instead of parallel outlines. 



In. Lin, 



Greatest length of scapula... 12 10 



■Glenoid cavity to anterior angle 7 9 



End of coracoid " " 5 



The deltoid process of the humerus is as wide as the condyle. Olecranon 

 distinct. There are two large carpals opposite the inferior digits, and three 

 smaller of the outer row, opposite the second, fourth and fifth respectively. 

 The three inferior digits are more closely approximated in the fluke than the 

 two superior. Phalanges (counting from above), 3 — 4 — 5 — 4 — 3 ; fourth digit 

 longer than second. 



In. Lin. 

 Length humerus, .>,. 5 1 



" ulna and radius 4 2 



" carpus and third digit 7 7 



Breadth at carpus 4 7 



The only specimen of this species at my disposal is not fully adult, as the 

 vertebral and humeral epiphyses are not yet anchylosed. It was brought by 

 Dr. Elisha K. Kane, on his return from the arctic regions, from what precise 

 locality is not stated. He presented it to the Museum of Comparative Zoology, 

 Cambridge, Mass., whence it was kindly lent me by Dr. Alexander Agassiz, to 

 whom my acknowledgements are due. 



PHYSETERID^E. 

 HYPERAODON Lacep. 



No species ef this genus from the Pacific Coasts is mentioned by Scammon, 

 but the present is embraced as an opportunity of alluding to the species of the 

 Eastern coasts of North America. 



In the Proceedings of the Academy 1865, p. 280, I characterized briefly a 

 whale of this genus under the name ofH. semijunctus, which is repre- 

 sented by a specimen in the Museum of the College of Charleston, So. Ca. 

 The characters furnished are meager, and it was anticipated that opportunity 

 would soon have occurred to amplify them. This has been, however, disap- 

 pointed, but is still looked forward to. 



Two years ago two individuals of this genus entered the harbor of Newport, 

 R. I., and after a lively chase one of them was captured. It measured twenty- 

 seven feet in length. Its bones were preserved, and some of them, including the 

 cranium, have been sent to the Academy of Natural Sciences, through the at- 

 tention of its member, Saml. Powell, of Newport. He has also sent numer- 

 ous photographs of its carcass, taken just after its capture, from various 

 points. 



These render it evident that the species is quite distinct from that described by 

 European authors as H. rostratus (or H. bidens). Its most striking feature 

 Is the relatively longer and more slender beak, and less elevated and prominent 

 front. This is obvious on comparison with the figures of Hunter, of Deslong- 

 •champs (Mem. Soc. Normandie) of Gray, (Zool. Erebus and Terror) and of F. 

 Guvier (Cetacea) and constitutes a material distinction. Thus, in the New- 

 port specimen, it is one-twelfth of the length, or 2\ feet; equal three-fourths 

 ihe distance between the eye and the spout hole. In a Cape Cod specimen 



1869.] 



