SIREXIA. 



Order SIRENIA. 



Family HALITHERIItm 



This family agrees with the Halicoridce in the presence of upper 

 incisors, but differs in having the crowns of the cheek-teeth 

 covered with enamel. 



Genus HALITHERIUM, Kaup 1 . 



Syn. Pugmeodon, Kaup 2 . 

 Halianassa, Meyer 3 . 

 C'hirotherium, Bruno 4 . 

 Met(ixytherium, Christol 5 . 

 Felsinotherium, Capellini 6 . 



The writer follows Gaudry (' Les Enchainements, &c. ITamm. 

 Tert.,' p. 35) in including Felsinotherium in the present genus. 

 There are a pair of tusk-like upper incisors (smaller than in Halicore) 

 and either five or six cheek-teeth in each jaw; small nasals are 

 present, at least in some species ; the premaxillae and the mandibular 

 symphysis are much deflected, and the angle of the mandible has a 

 descending plate ; the innominate is more developed than in exist- 

 ing genera, and there is a styliform femur. It has been observed 

 that in 77. schlnzi some of the permanent anterior cheek-teeth were 

 in some instances preceded by milk-molars ; the hinder cheek-teeth 

 resemble those of Hippopotamus, presenting, when partially worn, a 

 trefoil on one column of each ridge. Germs of inferior incisors were 

 developed. The synonymy of the species is so involved that some 

 of the following names must be regarded as provisional. 



Halitherium forestii (Capellini 7 ). 

 Syn. Felsinotherium forestii, Capellini 8 . 



This species is distinguished by its very large size and the great 

 extent of the downward flexure of the premaxillaB and of the two 



Neues Jahrb. 1838, p. 319. 



Loc. cit. 3 Ibid. p. 667. 



Mem. Ac. E. Sci. Turin, ser. 2, vol. i. p. 160 (1839). 



Ann. Sci. Nat. ser. 2, vol. xv. p. 307 (1841). 



Atti Soc. Ital. Sci. Nat. vol. viii. p. 281 (1865). 



Mem. Ac. Sci. 1st. Bologna, ser. 3, vol. i. p. 617 (1871). Felsinotherium. 



Loc. cit. 



