108 BULLETIN 36, UNITED STATES NATIONAL MUSEUM. 



10. CEPHALORHYNCHUS Gray. 



Cephalorhynchus, Gray, Cat. Cetacea, Brit. Mas., 18.50, p. 106. 

 ?Cephalorhynqnes, F. Ciivier, Hist. Nat. des C etacces, 1836, p. 15G. 

 EntrojnafGvaj, P. Z. S., London, 1862, p. 14,'). 

 Eutropia, Gray, Syuopsis of Whales and Dolphins, 1868, p. 7. 



Although Gray credits the name Ceplialorliynclms to F. Cuvier, it 

 was the former naturalist who first matle a formal separation of the 

 si^ecies. Cuvier states, at the place cited: 



Nous les aurions s^pardes des dauphins proprement dits sous le uom de c<5phalorhyu- 

 ques, si ces dift'dreuces extdrieures [previously pointed out] eusseiit entrain^ des dif- 

 fdreuces intdrieurc^plus niarqu6es. Uu exauien do cos especes i)lns approfondi <iue 

 cclni quo nous en avous pu faire diStermiuera peut-et're plus tard cette separation.* 



This aoristical genus includes representatives of four genera, the first 

 mentioned being I), rostrains, a species now referred to the genus Steno 

 If Cephalorhijnchus were to be accepted upon the authority of Cuvier, it 

 would have to be applied, under the rules, to the species included in Steno. 



Gray's distinctions are quite vague, and he has included J), ohscnrus 

 in his subgenus, which is now referred to Lagenorliynchus. His first- 

 mentioned species, however, is I). Heavisidei. Furthermore, his defini- 

 tion of CephalorhyncJiUs is, as alreadj^ stated, a formal one, and the 

 name itself is Latinized. 



Professor Flower has left but little to be said regarding this genus 

 and the species included under it. More facts must be forthcoming be- 

 fore the species can be placed upon a satisfactory basis. 



The principal cranial characters of the genus seem to me to lie in (1) 

 the separation of the pterygoids, (2) the great height of the nasal re- 

 gion, and (3) the expansion of the beak at the middle of its length. 

 The expansion of the beak causes the rami of the mandible to bow out. 

 As they are also bent downward toward the symplysis, the shape of 

 the jaw is quite peculiar and characteristic. 



CEPHALORHYNCHUS HEAVISIDEI Gray. 



Delphinus {Crampus) Heavisidei, Gray, Spic. ZooL, 1828, p. 2, pi. II, fig. G. 

 DcJphiniifs^Cejjhalorhynchus) Heavisidei, Gray, Cat. Cetacea Brit. Mus., 1850, p. 107. 

 Delphinus cajjoisis, F. Cuvier, Hist. Nat. des Mi>nimireres, liv. 58, 1829. 

 Deljyhiiins cephalorlnjnclms, F. Cuvier, Hist. Nat. der Cetac6es, 1836, p. 158. 

 i). hasfattis, F. Cuvier, Hist. Nat. des Cetacees, 1836, p. 161. 



Orca capensis, Van Beueden {nee Gray), Bull. Acad. E. Belg., 2d ser., xxxvi, 1873, 

 p. 32, 1 fig. 



Professor Flower has summed up the facts relative to this species in 

 such a manner as to leave little for me to add. I append measurements 



* This is a good example of what may be called gratuitous nomenclature. The au- 

 thor does not erect a name upon differences which he has discovered, hut suggests 

 that in case valid distinctions are found in the future such and such an appellation 

 would be appropriate. Similar examples are fre(iuent in zoological literature. 



