187 



Xiphodon secundarius (Filhol 1 ). 

 Syn. Xiphodontherium secundarium, Filhol 2 . 

 Hob. France. 



M. 2137. Part of the right ramus of the mandible, containing the 

 last five cheek-teeth ; from the Upper Eocene of Caylux 

 (Tarn-et-Garonne), France. This specimen agrees pre- 

 cisely with the one figured by Filhol in the Ann. Sci. 

 Geol. vol. viii. pi. xix. figs. 321-3. Purchased, 1885. 



M. 2138. The greater part of the left ramus of the mandible, con- 

 taining the last four cheek-teeth and the alveoli of the 

 earlier teeth ; from the Upper Eocene of Caylux. 



Purchased, 1885. 



Genus DACRYTHERIUM, Filhol 3 . 



The molars of this genus are nearest to those of Xiphodon, but 

 the premolars are less elongated ; there is no diastema. 



Dacrytherium ovinum (Owen 4 ). 

 Syn. Dichobunus ovinus, Owen 5 . 



There seems no reasonable doubt but that the so-called Dichobunus 

 ovinus, which P. Gervais 6 considered closely allied to Xiphodon 

 gracilis, belongs to Dacrytherium. It is a rather larger form than 

 D. cayluxense, Eilhol 7 ; and it is not improbable that it may be spe- 

 cifically the same as Xiphodon platyceps, Flower 8 , the cranium of 

 which is very like that of D. cayluxense, but of somewhat larger size. 



29174 a. The nearly complete mandible, showing all the teeth with 

 (Fig.} the exception of the two inner pairs of incisors ; from the 

 Headon beds (Upper Eocene) of the Isle of Wight. This 

 specimen is the type of the species, and is described and 

 figured by Owen in the Quart. Journ. Geol. Soc. vol. xiii. 

 p. 254, pi. viii. The length of the space occupied by the 

 last six teeth is 0,066, as against 0,062 in D, cayluxense. 



Ann. Sci. Geol. vol. viii. art. 1, p. 203 (1877), Xiphodontherium. 



Loc. cit. 



Compt.es Eendus, vol. Ixxxii. p. 288 (1876). 



Quart. Journ. Geol. Soc. vol. xiii. p. 254 (1857), Dichobumts. 



Loc. cit. 



Zool. et Pal. Fransaises, 2nd ed. p. 159. 



Ann. Sci. G6ol. vol. viii. pi. xviii. pi. x. figs. 254-6. Amended. 



Proc. Zool. Soc. 1876, p. 3, pi. i. 



