TRICHECHID, 197 
Family TRICHECHIDA. 
Genus TRICHECHUS, Linn.’ 
Dentition.—In the adult of the existing species it appears that the 
following teeth are usually present, viz. :—I. so C. is Pm. =. 
’ ld . 
Crichechus rosmarus, Linn.” 
Syn. Odobenus rosmarus, Allen * (ex Malmgren). 
Hab. 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. R. Hist. Nat. Belg. vol. 1. 
ply vill. fief (1877). Purchased. 
M. 1134. Cast of the right scaphoid. The original is from the 
Antwerp Crag, and is figured by Van Beneden, op. cit. 
figs. 8, 9. : Purchased. 
Trichechus huxleyi, Lankester’. 
Syn. Trichechodon hualeyt, Lankester °. 
This species was originally referred by its founder to the new 
genus Trichechodon, but subsequently (Trans. Linn. Soe. ser. 2, Zool. 
vol. ii. p. 213 [1882]) to Trichechus, the name Trichechodon being 
abolished. By Van Beneden® the species is identified with Alach- 
therium cretsi, but this is doubted by Lankester: if correct, the 
name husxleyt has the priority, and A. cretst should be referred to 
this species. 
Hab. Europe. 
1 Syst. Nat. ed. 12, vol. i. p. 49 (1766). 2 Loc. cit. 
8 History of North-American Pinnipeds, p. 23 (1880). 
* Quart. Journ. Geol. Soc. vol. xxi. p. 226 (1865), Zrichechodon. 
Loe. cit. 
§ Ann. Mus. R. Hist. Nat. Belg. vol. i. p. 53 (1877). On page 46, Trichechodon 
huxleyi is given as a synonym of T'richechodon konincki. 
