380 ON THE STRUCTURE OF HOOKER'S SEA-LION". 



while others, such as Clark, have, not unreasonably, referred all species to a single 

 senus — Otaria. Fr. Cuvier, in 1834, instituted two genera, among which he divided 

 all the species ; these were termed Arctocephalus and Platyrhinchus. The name 

 Platyrhinchm, however, cannot stand, since Peron ' had previously applied the name 

 Otaria to the same species, viz. 0. leonina (= O.jubata). I believe therefore that I 

 am right in retaining the generic name Otaria for 0. jubata. Moreover, as the species 

 which F. Cuvier 2 named Arctocephalus was apparently 0. pusilla, or 0. antarctica, as it 

 appears to be more correctly termed, this generic name is retained in the present 

 communication for that species and the others which I believe to be allied to it. 



A division of Sea-Lions which practically corresponds with that urged in the present 

 paper was made by Dr. Gray in 1865 3 . He then placed O.jubata in a section by itself 

 equivalent to the remaining species, which, however, were divided into numerous genera. 

 This classification, as regards the separation of O.jubata from all the remaining species, 

 was retained in a later communication published in 1869 4 . 



DESCRIPTION OF THE PLATES. 



PLATE LXIV. 



Three specimens of Hooker's Sea-Lion [Otaria hookeri) living in the Society's Gardens, 

 December 1887. 



PLATE LXV. 



Fig. 1. Fore flipper of Otaria hookeri. 

 Fig. 2. Hind flipper of the same. 

 (Both figures one half of the natural size.) 



1 ' Voyage au terr. Austr.' ii. p. 40 (1816). 



2 "De quelques Especes de Phoques et des groupes generiques entre lesquels ils se partagent," Mem. Mus. 

 Hist. Nat. t. si. (1824) p. 205. 



5 " Notes on the Skulls of Sea-Bears and Sea-Lions (Otariadae) in the British Museum," Ann. & Mag. Nat. 

 Hist. vol. xviii. 1866, p. 228. 



4 " Additional Notes on Sea-Bears (Otariadae)," Ibid. vol. iv. 1869, p. 264. 



