106 



HYPEBOODON LATirsoNS 1 , Gray. The Heavy -headed Hyperoodon. 



Synonyms Hyperoodon latifrons, Gray, Voy. Erebus and Terror. 



Lagenocetus latifrons, Gray, S. & W., p. 339. Suppl. p. 97. 



Inhab : North Sea. 



The reflexed parts of the cheek-bones are in this species much 

 thickened above, and in their altitude exceed the hinder edge of the 

 skull ; lower jaw straight, and also the beak of the skull. 



Eeinhardt remarks that " Eschricht believed, as ia known, that 

 Hyp. latifrons was established on a very old male of the common 

 Dogling (Hyperoodon rostratus), but Gray's species must now be 

 regarded as well grounded." 



Genus ZIPHIUS, Cuvier. 



Forehead tapering ; beak of the skull simple, and without tuber- 

 osities at its base ; respiratory aperture deep-seated ; cervical vertebrae 

 partially anchylosed. The intermaxillaries at their base, and the 

 occipital bones, form by their enlarged prominent edges around the sides 

 and behind the brain-case a large hemispherical cavity, which serves to 

 receive the head matter or spermaceti. The cranium thus exhibits a 

 strong connecting link in its general features between the Hyperoodon 

 and the Physeteridse ; with the former, by the elongated beak and 

 almost edentulous condition of the jaws, and with the latter by the 

 well denned spermaceti-cavity. 2 



ZIPHITJS CAViBOSTBis 3 , Cuvier. The Mediterranean Ziphius. 

 Synonym Petrorkynchus mediterraneus, Gray, Suppl. p. 98. 

 Inhab : Mediterranean. 



The skull of this singular cetacean was described about half a century 

 ago by Cuvier as the type of an extinct species, from the semi-fossilized 

 state in which it was found ; but which view, M. Gervais, from other 

 examples has shown to be erroneous. 



ZIPHIUS GEBYAISII, Duvemoy. Gervais' Ziphius. 

 Synonyms Hyperooden Gervaisii, Duvernoy. 

 Ziphius Gervaisii, Fischer. 



Epiodon Desmarestii, Gray, S. &~W.,p. 341, Suppl., p. 98. 

 Inhab : Mediterranean. 



The only notice we possess of this cetacean is derived from the short 

 account by Eisso, of the form and colouration of the living animal, 

 presuming his species to be the same as that described by Fischer, but 

 of which I am uncertain, nay, very doubtful. 



1 lotus, broad, ample, andyronj, forehead. 



2 Of the Ziphius cavirostris, Cuvier observes " Cette tete a, comme on voit, de grand 

 rapports avee le cachalot, et encore deplia grands avec I' Hyperoodon," Vol. V, p. 351, 



3 cavus t hollow, and rottrum, the beak. 



