340 ZIPHIIDiE. 



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

 Hyperoodon Jatifrons as weU as males. 



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

 from Greenland, the Orkneys, and the coast of Lanarkshire, this is 

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

 probably a much larger species than Hyperoodon rostratum, as the 

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

 while the largest skull of U. rostratum that has come imder my ob- 

 servation does not exceed 60 or 65 inches. 



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

 Hyperoodon rostratum and H. Jatifrons in the Plates to the ' Voyage 

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

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

 form of the lower jaw. The skuU of H. 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 //. 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. William 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 very 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 figure 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 front of the lower jaio, cylindrical, fmiform, or conical. Beak 

 of skull conical, TJie intennaxillaries enlarged behind, forming a more or 

 less large canity round the blowers. 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 

 sknU depressed, tapering. The vonier forming a sunken groove. 

 Intermaxillaries forming a modeimolyTiTgh 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 vertebrae 

 anchylosed." — Gervais. 



Ziphius, Duvernoy, Attn. Sci. Nat. xv. 65. 

 Ziphius, sp., Cumer, Oss. Foss.y. 



