320 



F. B. Loomis — Osteology and Affinities 



of nearly all parts of the skeleton ; but the find is composed 

 of the bones of more than one individual. 



As is characteristic of the skeleton, the skull is heavily 

 built, the cranial region being short, and the frontals wide. 

 The premaxillse and premolar regions are shortened over the 

 corresponding regions of S. gracilis, but the back of the skull 

 is about the same size. In dentition the upper incisors are the 

 usual well-developed chisel-shaped teeth crowded together ; 

 the canine is reduced and separated from the incisors by a 

 diastema of 4 mm , being a like distance from the tiny first 



Fig. 29. 



Fig. 29. Stenomylus crassipes, fused radius and ulna from the outer 

 aspect, x 1/2. 



premolar. The second premolar is also much reduced, as is 

 the third and the fourth, this last being 2 mm shorter than its 

 counterpart in S. gracilis. The molars, however, are relatively 

 enlarged, corresponding in length and width with those of 

 8. gracilis. The lower jaw is shortened in the regions in 

 front of the molars, the lower canine being wholly incisiform, 

 as is also the first premolar which is placed close to the canine, 

 all live of these teeth being grouped in the incisor aggregation. 

 The second premolar has a considerable diastema, both in 

 front and behind it, both being, however, shorter than those of 

 S. gracilis. The third and fourth premolars are also reduced, 

 and the molars are enlarged corresponding to those in the 

 upper jaw. 



The cervical vertebrae resemble those of S. MtchcocM in 

 character, but are thicker and shorter than in that of the S. 

 gracilis species. From the table of measurements it will appear 

 that the humerus is about the same length as that of S. gracilis, 

 but the ulno-radius is some 30 mm shorter and at the same time 

 much stockier. In the same way the metacarpus is materially 

 shorter and heavier, mt. Ill and mt. IV being fused together 

 for about half their length as in S. gracilis. The femur is 

 relatively long, actually longer than that of S. gracilis, but as 

 in the fore limb the tibia is extremely short, 35 mm shorter than 

 that of S. gracilis. The metatarsus is also short and stocky, mt. 



