824 THE WHITE EIVEE FAUNA. 



still more delicate groove extends along at the front of the inner angle. 

 The second and third molars are subequal; the last molar is a little smaller, 

 while the first is a little smaller than the fourth. All are subquadrate in 

 horizontal outline, but the first is narrowed in front. The composition ot 

 the molars has already been described. It remains to add that the posterior 

 cross-crest is absent from the fourth molar, and the anterior one from the 

 first molar. Thei'e are no basal cingula on the internal or external sides of 

 the crowns. The direction of the dental series is moderately oblique to that 

 of the axis of the ramus, and the posterior alveolar walls do not project very 

 far either posteriorly nor inwards. The interior face of the ramus below 

 the last molar is quite concave. The surface of the bone of the inferior 

 surface is sparsely punctate. 



The head of the femur, ascribed to this species with doubt, is perfectly 

 round in vertical section, and is not prolonged transversely. The fossa Uga- 

 menti teris is submedian and isolated. The neck is constricted. There is 

 a faint rectangular connection between the posterior ridges of the great and 

 little trochanters. The femoral condyles are well separated, and the shaft is 

 flat above them on the posterior face. The ridge forming one of the borders 

 of the patellar groove is continued on the shaft as a rounded angle. 



The distal portion of the shaft of the tibia has three sides, viz, a poste- 

 rior flat side, an antero-external flat side, and a rounded anj;ero-internal side. 

 The fibular face forms another rather elongate facet. The process which 

 carries the tendon of the flexor longus poUicis is acute below, and carries an 

 anteriorly-directed crest on the inner edge of the groove, which sinks into 

 an angle of the shaft. The posterior border of the astragaline face of the 

 tibia is truncate. The two trochlear grooves are separated by a wide ridge. 



Measurements. 



M. 



Length of mandibular ramus from incisive alveolus to deutal foramen 0110 



Length from same to end of Last molar 0090 



Length from same to first molar 0040 



Depth of inner face of ramus at diastema 0030 



Depth of inner face of ramus at first molar 0036 



Depth of inner face of ramus at last molar 0032 



Depth of inner face of ramus at coronoid process 0052 



^. J. r ■ ■ (anteroposterior 0012 



Diameter of incisor .; ' 



' transverse 0009 



^. . J 1 (anteroposterior (.012 



Diameter second molar < '^ 



< transverse 0012 



Length of superior molar series 0043 



