CONDYLAETHRA. 495 



dus or a carnivore. The tuberosities are not produced, and thero is no 

 external epicondyle. The internal is large, and sends upwards the bridge 

 that incloses the epicondylar foramen. 



The pelvis is not well preserved in the specimens. It shows a rather 

 narrow, triangular neck, a well-marked anterior inferior spine, and an open 

 acetabular groove. The femur shows a fossa ligamenti teris, and the third 

 trochanter on the middle of the shaft, and well developed. The tibia has 

 an anterior crest, and no notch on the antero-external edge of the head. 

 The internal malleolus is a prominent tuberosity, and the astragalar face is 

 scarcely grooved, and oblique, as in the Creodonta. The distal extremity of 

 the fibula articulates with the sides of the astragalus, but not with the cal- 

 caneum. The calcaneum much resembles that of Phenacodus. It is elon- 

 gate, and the astragalar facet is not longitudinal, but very oblique. The 

 astragalus has trochlear keels of unequal height, and a shallow groove 

 between them, much less marked than in Phenacodus, but not so flat as in 

 PeripfycJms. The neck is elongate, and the distal articular surface is con- 

 vex in every direction. 



The number of toes in Meniscotherium is unknown. Metapodial bones 

 preserved are rather narrow, leading to the supposition that the digits are 

 similar to those of Phenacodus and Periptychus. The posterior keels of the 

 distal extremities of the metapodials are distinct. 



Three species of this genus are known to me. They may be distin- 

 guished as follows : 



Length of last four molars, M. .034 M. terrcerubrw. 



Length of last four molars, M. .029 . M. chamense. 



Length of last four molars, M. .024 M. tapiacitis. 



The superior molars of this genus have some resemblance to those of 

 Hyopotamus, but the inferior molars are different, and of the Anchitherium 

 type. The temporary last molar differs from its successor, the permanent 

 fourth premolar, in its more complex character. It is in fact identical in 

 structure with the true molars. The second and third milk molars differ 

 from their successors in their greater anteroposterior extent. The third has 

 an internal lobe opposite the posterior half of the external wall. 



