CETACEA. 63 



Lacepede (Cetacea, 164) described it as a genus under the name 

 of Anarnacus, and Illiger (Prod. 142) under that of Ancylodon ; 

 and in the Zoology of the Erebus and Terror, on the strength of 

 Fabricius's usual accuracy, I adopted the views of this naturalist; 

 but Prof. Eschricht's observations have induced me to believe that 

 Cuvier and other naturalists have been right in considering it as 

 a synonym of Hyperoodon. 



The error of Fabricius is very pardonable, as Desmarest and 

 Lesson have mistaken the upper for the lower jaw, in Chemnitz's 

 description (Desm. Mam. 520 ; Lesson, Mam. 427 ; Cetac. 120); 

 and M. F. Cuvier has not well understood it, as pointed out by 

 M. Wesmael (/. c.), and Illiger makes the same mistake with re*- 

 gard to his species. 



Physeter bidens (Sowerby) has been referred to this genus, but 

 the form of the head and position of the fins, the teeth, and the 

 form of the skull, show it to be a Ziphius. 



The descriptions of the species of this genus are so different, 

 that I am inclined to keep them distinct, for the purpose of call- 

 ing attention to them. Cuvier regarded them all as one. 



t Crest of skull thin and far apart on the upper edge. 



* Dorsal fin in the centre of the back. Hyperoodon, Lacep. 

 Uranodon, Illiger. 



1. HYPEROODON BUTZKOPF. The BOTTLE-HEAD. 



Black, beneath lead-coloured; dorsal fin central- lower jaw 

 with two pointed teeth in front, sunk in the gums ; " palate with 

 acute, hard points;" blowers transverse, lunate, with the con- 

 vexity in front. 



1. Hyperoodon Butzkopf, Lacep. Cetac. 319, from Baussard, 



Journ.Phys.xxxiv.20l. t. , copiedF. Cuv. Cetac. 241. 1. 17. 



f. 1. 1. 11. f. 1, cop.; Gray, Zool. Erebus fy Terror, 20. t. 3. 



f. 1, 2, animal, f. 4, 5, skull. 

 Delphinus ? edentulus, Schreb. Saugth. t. 347. 

 Nodus (edentulus), Wagler, N. S. Amph. 34. 

 D. Hyperoodon, Desm. Mam. 521 ; Fischer, Syn. 515. 

 D. Honfloriensis, Desm. 



D. Butzkopf, Bonnat. 25; Desm. N. Diet. ix. 176. 

 Heterodoii Hyperoodon, Lesson, Man. 419. 



2. Bottle-head, or Flounder's Head, Dale, Hist. Harwich, 411. 



t. 149, cop. 

 Beaked Whale, Penn. Brit. Zool. t. 



? 3. Monodon spurius (Anarnak), 0. Fab. Faun. Green. 31 ; Bov- 

 nat. Cetol. 1 1 ; hence 



