62 CETACEA. 



Monodon (spurius), sp. O. Fab. 

 Heterodon (sp.), Desmarest, Mam. 

 Delphinus (sp.), Desmarest, Mam. 



3.1 Diodypus, Rajin. Anal Nat. 60, 1815; no type nor char. 



Cervical vertebrae united, all anchylosed together. Mus. Hull. 

 Graves, Edin. Phil. Journ. 1830, 59. 



According to Voight and Wesmael, the ends of the blowers, as 

 in other dolphins, point forward. Dale, Baussard and Doumet 

 describe them as pointing backwards ; Desmarest and others as- 

 sumed the latter as a generic character. 



This genus is at once known from Delphinorhynchus, without 

 examining the skull, by the head being more convex and rounded 

 in front, and the two teeth being situated in the front end of the 

 lower jaw, while in that genus they are in the middle of each side. 



Lacepede called the genus Hyperoodon, and Illiger Uranodon, 

 because of the teeth on the palate described by Baussard. They 

 have not been observed on other specimens; and Illiger, in 

 his generic character, by mistake says the two teeth are in the 

 upper jaw (Gen. 143); and Professor Eschricht, in his unpub- 

 lished paper, has proposed the name of Chenocetus, instead of 

 Hyperoodon, which is founded on an erroneous description, as 

 the name Goose-whale., or its translation, is applied to this ani- 

 mal by the inhabitants of most part of the seas where it inhabits, 

 and Dr. Jacob calls it Cetodiodon. 



Professor Eschricht, in the Danish Transactions, has given an 

 account of the history of the genus, and of its anatomy, in- 

 cluding some admirable details of its brain. He also shows 

 that there are numerous small teeth in the jaws (see fig. at 

 pp. 331-335), besides the two large teeth in front. Danish Acad. 

 Trans, xi. 327, 331, 332, 334, 335. 



O. Fabricius described a whale under the name of Monodon 

 spurius, called by the Greenlanders Anarnak, as having two small, 

 conical, slightly-curved, blunt teeth prominent in front of the 

 upper jaw; the lower jaw toothless. M. Cuvier (Oss. Foss.) re- 

 gards it as a Hyperoodon, and he only believed in the existence 

 of one species of the genus. M. F. Cuvier, who misunderstood 

 the description of Chemnitz with respect to the teeth of Balana 

 rostrata, is inclined to unite it to that species, with which it 

 agrees in being all black, but observes they differ greatly in 

 size. F. Cuv. Cetac. 226. It cannot be the young Narwhal, for 

 the back is finned. 



Professor Eschricht regards the Anarnac or Monodon spurius, 

 0. Fab., as the common Hyperoodon, in which Fabricius mistook 

 the lower for the upper jaw. The fat of Hyperoodon is purga- 

 tive, as Fabricius describes to be the peculiarity of the Anarnac. 



