MICROTHERJLUM. 371 



bruge near Apt. The dental formula of Xiphodon is the 

 typical one, viz. — i g, c ^, p ^, m g^J = 44. 



The teeth are arranged in a continuous series in both jaws. 

 The canines and first three premolars have the crowns more 

 extended antero-posteriorly, lower, thinner transversely, and 

 more trenchant, than in the type Anoplotheria (whence the 

 name Xiphodon, or sword-tooth). The feet are diclactyle, 

 with metacarpals and metatarsals distinct. The tail is short. 

 The lower true molars have two pairs of crescentic lobes with 

 the convexity turned outwards. It was nearly allied to 

 Dichodon. 



Genus Dichobune. — The genus Dichobune was proposed by 

 Cuvier, in the second edition of his Ossemens Fossiles, 4to, torn, 

 iii., 1822, p. 64, for the Anoplotherium minus of the original 

 Memoir in the Annates du Museum, torn, hi., 1803, and for 

 the A. leporinum of the 4to edition, 1822, torn, i., pi. 2, fig. 3 ; 

 and torn, iii., pp. 70 and 251. It is closely allied to the ano- 

 plotherioid genus Xiphodon ; the dental formula is the same, 

 only there is a slight interval between the canine and the first 

 premolar in both jaws ; the first three premolars are subcom- 

 pressed, subtrenchant, but less elongated from behind forwards 

 than in Xiphodon. Besides the two normally-developed and 

 functional digits on each foot, there may be one, sometimes 

 two, small supplemental digits. 



A species of this genus {Dichobune ovina, Ow.) has been 

 founded upon an almost entire lower jaw with the permanent 

 dental series, which now forms part of the palasontological 

 collection in the British Museum. It is from Hampshire 

 upper eocene. 



Genus Microtherium. — Entire crania of Microtlierium, 

 from the lacustrine calcareous marls of the Puy-de-D6me, are 

 in the British Museum : they shew that the hinder division 

 of the upper true molars is complicated by the additional 

 (third) cusp. The Microthere did not exceed in size the 



