56 



NORTH AMERICAN FAUNA. 



[No. 38, 



Fig. 10. — Fore foot of S. I. latimanus (X 1 J) 

 to in fig. 8. 



B 2016-103 

 Individual referred 



foramen relatively small (larger than in Scalopus), the plate forming 

 its outer wall moderately broad. Audital bullae complete, depressed; 

 auditory meatus short (more developed than in Scalopus), External 

 pterygoid region moderately inflated both posteriorly and anteriorly. 

 Mesopterygoid space moderately broad and relatively long, the sides 

 nearly straight and shghtly converging posteriorly. Palate mod- 

 erately elongate, termin- 

 ating at a distance pos- 

 terior to the last molar 

 about equal to half the 

 diameter of that tooth; 

 posterior border of palate 

 truncate or shghtly emar- 

 ginate, usually with a 

 shght median notch. An- 

 terior palatine foramina 

 moderate, oval to ellip- 

 tical-oval; posterior pala- 

 tine foramina small (the 

 first pair larger than the second), round to oval. Horizontal ramus of 

 mandible moderately heavy, somewhat curved upward at posterior end, 

 nearly straight at anterior end; coronoid moderately elongate, quad- 

 rate, truncate, directed almost perpendicular to median line of horizon- 

 tal ramus; angle of mandible large and heavy (relatively longer than 

 in Scalopus)', inferior mandibular notch 

 large, subcircular, relatively broad and deep. 



Dental cliaracters. — First upper incisor 

 long and broad, convex anteriorly, flat pos- 

 teriorly ; second and third upper incisors and 

 upper canine simple, conical, of moderate 

 size, subequal, about two-thirds as long as 

 first incisor. First, second, and third upper 

 premolars similar to second and third inci- 

 sors, the third premolar usually with a small 

 postero-basal cusp; fourth premolar much 

 larger than third, more cuspidate, with a 

 large posterior cusp, usually with an intero-basal cusplike process, 

 and frequently with a more or less developed antero-basal cusplike 

 process. Upper molars W-shaped in transverse section, with an 

 antero-intemal V-shaped cusplike shelf (not lobed) ; first and second 

 molars subequal, the third much smaller. 



First seven lower teeth (incisors, canine, and first, second, and 

 third premolars) small, conical, the first and third incisors smaller 

 than the other teeth, which are subequal; premolars each with a 



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Fig. 11.— Hind foot of S. I. lati- 

 manus (X IJ). Indi\adual re- 

 ferred to in fig. 8. 



