NATURAL SCIENCES OF PniLADELPHIA. 21 



DELPUINIDJE. 



This family is most numerously represented by species in the order. The 

 genera are also numerous. Those represented in the ocean bordering North 

 America are the following: 



I. The phalanges numerous. 



Pectoral fins, long narrow, on the lower part of the sides ; cervical vertebrae 

 consolidated; the teeth few, obtuse; dorsal tin Globiocephalus. 



II. The phalanges not more than 4 — 5 in the same digit. 



«. Two or more cervical vertebra consolidated. 



Si. Teeth cylindric. 



i. Beak of skull short, broad ; teeth few. large ; a dorsal fin. 



Teeth early deciduous Grampus. 



Teeth permanent, acute Orca, 



(AT. Beak of skull elongate, exceeding brain case; teeth small, numerous. 



Dorsal fin present; teeth long, more or less acute Delphinus. 



Dorsal fin none; teeth as last Delphinapterus. 



Dorsal fin ? teeth short, obtusely rounded Sagmatias. 



/?/?. Teeth compressed, spade-shaped. 



Dorsal fin present '. Phocfcna. 



Dorsal fin none ." Neomeris. 



a*. Cervical vetebra; all distinct. 



/?. No dorsal fin. 



Teeth little deciduous; incisors normal Beluga. 



Teeth deciduous, except one incisor, which is prolonged into a tusk. 



Monodon. 



GLOBIOCEPHALUS Gray. 



The "black-fish" of whalers are included in this genus; the species repre- 

 sent it in all seas as yet known. They differ less in remote regions than the 

 species of some other genera do. The species of the eastern coasts of North 

 America appears to be the same as that found on the coasts of Europe, the G. 

 m el as. The species of the Pacific coasts is fortunately so fully described by 

 Capt. Scammon, that it can be distinguished very readily from those hereto- 

 fore recorded. 



Globiocephalus scammonii Cope. 



For details of character of this abundant species I refer to Capt. Scaramon'a 

 description, and only contrast it here with the species to which it is allied. It 

 pertains to the section of the genus characterized by the absence of white 

 band or other mark on the abdomen, and is among these one of the most uni- 

 formly black species. Its more numerous teeth 'g**!!! distinguish it from G. 

 machrory nc hus of the South Seas. In Gray's Catalogue three species 

 remain for comparison, the G. c h i n e n s i s, which probably does not belong 

 to the genus ; the G. s i e b o 1 d i i, which, not being described, cannot be re- 

 garded as valid ; and G. in die us Blyth. The measurements of the latter 

 indicate a much wider pectoral fin, a longer and lower dorsal fin, and consid- 

 erably wider flukes. The measurements given by Blvth are as follows : 



Ft. In. 



Total length 14 2 



Width flippers 2 6 



Length dorsal 2 6 



Depth " 11 



Extent of flukes 3 



It inhabits the Bay of Bengal. 



The present species is named in honor of Capt. Scammon, who has furnished 

 us with a mass of information on the subject of the Marine Mammalia, and an 

 amount of novelty in connection with it seldom equalled in the history of 

 zoology. 



1869.] 



