340 iiipniiDJE. 



young male. So there can be little doubt that there arc females of 

 Hyperoodon latifrons as well as males. 



" It appears to be a northern species. As I have seen specimens 

 from Greenland, the Orkneys, and the coast of Lanarkshii'e, this is 

 the most southern example that has yet occurred to me. It is also 

 probably a much larger species than Htjperoodon rostratinn, as the 

 skull from Greenland in the Newcastle Museum is 92 inches long, 

 while the largest skull of H. rostratum that has come under my ob- 

 servation does not exceed GO or 05 inches. 



" It is only necessary to examine the figure of the two skulls of 

 Hrjperoodon rostratum and H. latifrons in the Plates to the ' Yoyage 

 of the Erebus and Terror,' to see how exceedingly different they are 

 from each other, not only in the form of the skull, but also in the 

 form of the lower jaw. The skull of //. latifrons not only differs 

 from that of H. rostratum in the thickness and solidity of the frontal 

 crest of the maxillary bones, but in the crest being much higher than 

 the hinder part of the skull ; while in all the skulls of H. rostratum 

 I have seen, the crest is of the same height with the frontal ridge. 



" As regards Hyperoodon rostratum, Mr, Beardsworth states his 

 specimens to be a female and a young female. The specimen which 

 was shot at Weston-super-Mare, Mr. Crotch informs me, is a female. 

 I may also observe that the specimen of this species described by 

 Mr. WiUiam Thompson in the Annals and Mag. of Nat. Hist. 1846, 

 vol. xvii. p. 150, is said to be a male : its skeleton is now in the 

 Belfast Museum. So there are certainly male and female of this 

 species also known." — Gray, Proc. Zool. Soc. 1860, 424, 425. 



M. Gervais (Zool. et Paleont. Fran^. t. 38. f. 6) believes that 

 Layenocetus latifrons is established on the skull of a veiy aged 

 animal, and he thinks that the crest thickens with age. He does not 

 seem to have observed the form of the hinder part of the skull. He 

 gives a reduced copy of the figiire in the ' Zoology of the Erebus and 

 Terror/ instead of figuring a skull in the intermediate state of crest, 

 which would have proved that such a specimen existed and had been 

 seen by him. 



B. Teeth in fro^it of the lower jaw, cylimlvic(d, fimform, or conical. Beak 

 of skull conical. The intennaxillarics enlarged hchi)ul,fonniny a more or 

 less large cavity round the hlotvers. Epiodontina. 



3. EPIODON. 



Head tapering, lower jaw rather bent up. Dorsal fin falcate, 

 three -fourths of the entire length from the nose. The beak of the 

 skull depressed, tapering. The vomer forming a sunken groove. 

 Intermaxillaries forming a moderately high basin round the blowers. 

 Upper jaw toothless. The lower jaw elongate, tapering, rather bent 

 up and truncated at the end, with two conical teeth, and with a 

 sunken groove on the edge just behind them. " Cervical vcrtcbrtc 

 anchylosed." — Gerva is. 



Ziphius, Duvernog, Ann. Sci. Nat. xv. 05. 

 Ziphius, sp., Cuvier, Oss. Foss. v. 



