328 zipniiD.'E. 



1. HYPEROODON. 



Forehead convex. Blower transverse, slightly convex forward in 

 the middle, and bent hack a little at the ends. (Jape short, only as 

 long as the short beak. The eyes near and the ears far behind the 

 gape. The crests of the maxillary bones thin and wide apart above. 

 The beak of the sknll descending forwards. The hinder edge of 

 the sknll as high as the crests. Lower jaw rather curved. Blade- 

 bone triangular, angles very acute ; the acromion very broad at the 

 end, directed downwards, and the coracoid upwards, the upper edge 

 with a prominence (see Cuvicr, Oss. Foss. v. .318. t. 24. f. 213). The 

 bones of the arm short ; fingers short (Cuv. 318). Cervical vertebra; 

 united, all anchylosed together. — Mus. Hull ; Graves, Edinh. Phil. 

 Journ. 1830, 59. 



1. Hyi^erodon, Rafin. Anal. Nat. GO, 1815 ; Gra^j, P. Z. S. 1804, 2.39. 

 Hyperoodon, Lacep. ; Cuiier, Oss. Pass. v. 327. t. 24 ; Grai/, Cat. Cetac. 



B. M. 1850, 61 ; Durernoy, Ann. Sci. Nat. xv. 44, 1851; Romseau, 

 Mar/. Zool. 1858, 205. 

 Chenodelpliiuus, Eschricht, Isis, 1844, 805. 



2. Uranodon, lUkjer, Prodi: 14:!, 1811. 



Nodus (sp.) edeiitulus, Waaler, N. S. AnipJi. -34. 



Orca, Wagler, N. tS. Antph. .'U. 



Anarnacus, Lacep. ; Dimicril, Z. A. ; Rajin. Anal. Nat. 01, 1815 ; Graj/, 



Zool. Preh. 8^ Terror. 

 Ancylodon, Pliger, Prodr. 142, 1811 ; Oken, Lehrh. Nafar;/. (!73, 1815. 



3. Hypodon, Haldeman. 

 Chenocetus, E'chricht, Panish Trans. 

 Cetodiodon, Jacob, iJnhlin PhU. Journ. 

 Diodon, Lesson, Q^^trr. Buf'on, i. 124. 

 Monodon spvmus, O. Frdir. 

 Ileterodon, sp., Dcsniarest, Mamm. 

 Delphinus, sp., Desmarcst, M(tmm. 



4. PDiodypus, Rafin. Anal. Nat. GO, 1815 (no type or char.). 



In the British Museum there is the mass of the cervical vertebrae 

 of a young Hyperoodon B utzlcopf. It is unfortunately not in a good 

 condition, the edges being Morn, and the upper lateral processes of 

 the hinder cervical vertcbroD being broken off. It agrees in general 

 shape with the cervical vertebra) of Lagenocctus ; but the upper cones 

 formed of the united neural arches are not so high, nor keeled in 

 front ; the piincipal difference is in the seventh cervical vertebra 

 and its lateral processes and neural arch being as completely united 

 to the other vcrtebiaj as any of the rest, they all seven forming a 

 single bony mass. 



The canal of the spinal marrow is very large, but otherwise like 

 that of Lagenocetus ; but the hinder part of the canal is higher, being 

 as high as wide above, and its width is rather greater than half the 

 width of the body of the seventh cervical vertebra. 



According to Voigt and Thompson the ends of the blowers point 

 forward ; Dale, Baussard, Doumet, Bell, and Jenyns describe them 

 as pointing backwards ; Desmarest and others assumed the latter as 



