22 CONTENTS OF A BONE CAVE. 



M. 



Width of astragalus ]P osteriorI y - 044 



(medially ..... .030 



" of external superior face . . . . . .017 



" of internal " ..... .009 



" of internal face. ...... .009 



Depth at internal border . . . . . . .014 



" of internal facet of head ..... .012 



Diameter of navicular facet -j vertical 



(transverse . . . .018 



Portions of a sacrum and a lumbar vertebra of another individual of the size of 

 this species present some additional characteristics. Thus the anterior margin of 

 the middle of the neural arch in the first sacral is produced into a pointed process 

 which separates two fossa?. The anterior zygapophyses in front of these are well 

 developed, directing their articular faces upwards and outwards at an angle of 45. 

 The diapophysis of the lumbar arises from the summit of the neurapophysis, and 

 is directed forwards at an angle of 45. The section of the shaft is triangular and 

 the apex is acuminate. Its length is .030 ; vertical diameter of neural canal .024. 

 The anterior zygapophysis is produced upwards and a little outwards ; its face is 

 nearly vertical. 



ARTIODACTYLE. 



The following characters are derived from the right maxillary bone of a young 

 animal which supports the temporary dentition, and from the bones of two indi- 

 viduals, one adult and the other young, probably the one to which the maxillary 

 bone pertained. I give the full characters for the benefit of those who have the 

 opportunity of studying the numerous species of the order found in the Old World. 



Temporary superior dental series of the maxillary bone, Pm. 1 ; M. 3 ; other 

 teeth unknown. Last premolar with an external subacute column, and an inter- 

 nal short column, which are united posteriorly, forming a rather wide grinding 

 face, which has an external cutting edge; no single anterior column. True molars 

 with four usual crescents, whose anterior horns are the inferior extremities of ver- 

 tical ribs. The lakes are without cementum, and are united at their adjacent 

 angles for some distance into the crown. The crowns of the molars are moderately 

 elongate, and the roots of the anterior teeth are rather long. 



The temporary premolar of this genus is more simple than the last of the per- 

 manent series in Anchcnia, biit presents a more complete inner crescent than does 

 the penultimate premolar in that genus. Its inner crescent is better developed than 

 that of the genus Camelus, since it is united with the external one at both ex- 

 tremities. The animal is apparently a member of the Bovidce. 



Attached to the entire maxillary bone are the malar and palatine bones, in 

 complete preservation. These bones display some interesting relations which I 

 now describe. The premaxillary bone evidently reached the nasals in the complete 

 skull. The palate is deeply emarginate posteriorly. The emargination between 

 the maxillary and the procesms pyramidalis of the palatine is profound. The 



