74 CETACEA. 



Nodus Dalei, Wagler, N. S. Amph. 34, 1830. ^ 

 Delphinorhynchus micropterus, Dumortier, Mem.Acad.Brux.xii. 



t. 1-3, good; F. Cuv. Cetac. 114. t. 9. f. 1, not good; t. 7, 



skull. 



JJelphinus micropterus, Cuv. Reg. An. i. 288. 

 Heterodon Dalei, Lesson, Man. Mam. 419, from Blainv. 

 Aodon Dalei, Lesson, Ouvr. Buffon, i. 155. t. 3. f. 1. 

 Inhab. Coasts of Europe. Havre, 1825, Blainv. Ostend, 1835, 



Dumortier. 



M. Dumortier found, near the middle of each side of the lower 

 jaw, an alveolus, as if for a tooth. His figure represents the 

 pectoral as f , and the dorsal as f , from the end of the nose. 

 The following are the measurements of the two described speci- 

 mens : 



Blainv. $ Drnn. $ 



ft. metres. 



Length, entire 15'0 3'45 



of head 27 (nose) 0'33 



to blowers .... 2'3 0'44 



to pectoral 3'4 0'91 



of pectoral .... 1-6 0'30 



to dorsal 9'1 2'04 



of dorsal (HO 0'27 



to eye 0'49 



to the vulva 2'21 



Circumference 7*6 2'0 



Width of pectoral .... 0'6 0'12 



of caudal 3'0 0'68 



Height of dorsal O'l 1 0'27 



Breadth of blower 0*10 



b. Upper and lower jaw with few or deciduous teeth. Wings 

 of the maxillary bones expanded and shelving downwards. 

 The beak short, deflexed. Forehead convex. Head round- 

 ed, without any beak. Monoceratina. 



Diodonea, pars, Rafin. Anal. Nat. 60, 1815. 

 Monoceratina, Gray, Zool. E. fy T. 



* Lower jaw toothless. Upper jaw with tusk. 

 4. MONODON. 



Head round and convex in front ; dorsal fin none ; lower jaw 

 not so wide as the upper, toothless. Upper jaw in the male (and 

 rarely in the female) with a produced spiral tusk. 



