364 MR. C. FORSTKR COOPER ON 



There is yet another specimen of a lowei jaw with a much- 

 worn first molar and roots of the last premolar and second and 

 third molars. The first molnr is 22 mm. long and aliout 12 mm. 

 broad, and is therefore lai'ger than the other specimens. The 

 lower border of the jaw is extremely straight, as in Phyllotillon 

 nariciis. In size it seems to coi'respond with Pilgrim's unnamed 

 fragment. Whether it represents a sexual difference from 

 Schizotheriamjnlgrimi or yet a third species remains unsolved. 



Text-figure 5. 



? Metacarpal or nietatarsa] of a Clialicotlieroid. Nat. size. 



Until the anatomy of these animals, and indeed of all Chalico- 

 theres with the exception of Moropus, is better known, it is 

 impossible to feel sure of their generic position. A good deal 

 of interest lies in the condition of the feet and the gi-adual lo.ss of 

 the first and fifth toes. According to Holland and Peterson*, 

 both should be present in the fore foot of the ScJiizothermice. In 

 the present collection are several phalanges and one bone which 

 may be a latei-al podial (text-fig. 5) ; it is just possible that it 

 may represent a fifth metacarpal or tarsal. Of the phalanges 

 three out of six show the co-ossification of the proximal and 

 median (text-fig. 6), which was evidently a common feature, as 

 Holland and Peterson describe it in Morojms. The free proximal 

 phalanges all show strongly-marked tubercles on the po.sterior 

 faces (text-fig. 7) for the flexor attachments. Some of the 

 fused bones show this feature, but to a less degiee. The}- are 

 not to be found in corresponding bones of Macrothermm or 



* Loc. cit. p. 201. 



