197 



Family TRICHECHLILE. 

 Genus TRICHECHUS, Linn. 1 



Dentition. In the adult of the existing species it appears that the 

 following teeth are usually present, viz. : _ I. -, C. -, Pm. P. 



ricf)td)u$ rosmarus, Linn. 2 

 Syn. Odobcenus rosmarus, Allen 3 (ex Malmgren). 

 Hob. Arctic Ocean and Northern Europe. 



46134. The nearly complete mandible; dredged on the Dogger 

 Bank, Eastern coast. This specimen shows the alveoli of 

 the teeth ; it is noticed by W. Davies in the Geol. Mag. 

 dec. 2, vol. v. p. 98 (1878). 



Owles Collection. Purchased, 1874. 



M. 1133. Cast of the centrum of the twelfth dorsal vertebra. The 

 original is from the Antwerp Crag, and is figured by Van 

 Beneden in the Ann. Mus. E. Hist. Nat. Belg. vol. i. 

 pi. viii. fig. 7 (1877). Purchased. 



M. 1134. Cast of the right scaphoid. The original is from the 

 Antwerp Crag, and is figured by Yan Beneden, op. cit. 

 %s. 8, 9. Purchased. 



Trichechus huxleyi, Lankester 4 . 

 Syn. Trichechodon huxleyi, Lankester 5 . 



This species was originally referred by its founder to the new 

 genus Trichechodon, but subsequently (Trans. Linn. Soc. ser. 2, Zool. 

 vol. ii. p. 213 [1882]) to Trichechus, the name Trichechodon being 

 abolished. By Van Beneden 6 the species is identified with Alach- 

 iherium cretsi, but this is doubted by Lankester : if correct, the 

 name huxleyi has the priority, and A. cretsi should be referred to 

 this species. 



Hob. Europe. 



1 Syst. Nat. ed. 12, vol. i. p. 49 (1766). 2 Loo. cit. 



3 History of North-American Pinnipeds, p. 23 (1880). 



4 Quart. Journ. Geol. Soc. vol. xxi. p. 226 (1865), Trichechodon. 

 Loc. cit. 



6 Ann. Mus. E. Hist. Nat. Belg. vol. i. p. 53 (1877). On page 46, Trichechodon 

 huxleyi is given as a synonym of Trichechodon konincki. 



