86 



NORTH AMERICAN FAUNA. 



[No. 38. 



tlie first pair ^ reniform or elliptical-oval and about twice as large as 

 the second pair which are usually eUiptical. Horizontal ramus of 

 mandible weak, curved upward posteriorly, straight anteriorly; coro- 

 noid moderately long, somewhat broad, but relatively weak, erect, 

 -slightly acute ; angle of mandible very long and slender (much longer 

 and narrower than coronoid), the inferior edge turned inward; in- 

 ferior mandibular notch large and angular. 



Dental characters. — First upper incisor large, semiovate, curved 

 inward and directed anteriorly; second upper incisor Hnear, minute, 

 lying close under base of first incisor; third upper incisor lateral, 

 large, elongate, caninelike, with a small postero-basal tubercle dis- 

 appearing with age. Upper canine short and slender (less than half 

 dimensions of third incisor), conical. First, second, and third upper 

 premolars small, laterally compressed, successively increasing in size 

 posteriorly, each with an anterior and a posterior basal tubercle; 

 fourth upper premolar similar to third, much larger, with an interior 

 basal cusphke process. Upper molars W-shaped in transverse sec- 

 tion, with an interior basal sheK having an indistinctly tricuspidate 

 edge; first and second molars nearly subequal, the third much 

 smaller. 



First lower incisor moderate in size, spatulate, flat, directed ante- 

 riorly; second incisor close and superior to first, similar in shape, 

 much smaller (about half as large), directed anteriorly; third upper 

 incisor minute, slightly flattened apically, curved downward, directed 

 anteriorly. Lower canine long, slender, curved posteriorly, with a 

 rather large posterior basal accessory cusp and a very small anterior 

 one. Lower premolars small (successively slightly increasing in size 

 posteriorly), compressed laterally, each with a weU-developed poste- 

 rior cusplike heel and a small cusplike development (minute in the 

 first premolar) of anterior portion of cingulum. Lower molars M- 

 shaped in transverse section, laterally compressed; interior shelf 

 narrow, tricuspidate, the median cusp indistinctly bifid; first and 

 third molars subequal, the second slightly larger. Dentition: i. f ; 

 c. ^ ; pm. I ; m. f ; total 44. 



CONDYLURA CRISTATA (Linn^us). 

 Star-Nosed Mole. 

 (PI. IV, fig. 12; PI. V, figs. 6, 6a; PI. VI, fig. 21.) 

 Sorex mstafws Linnseus, Syst. Nat., ed. 10, vol. 1, p. 53, 1758. 



Taljpa longicaudata Erxleben, Reg. Anim., p. 118, 1777. Based on Pennant's long- 

 tailed mole; type locality, North America. 

 Talpa Cristata Zimmermann, Specimen Zool. Geog., p. 496, 1777. 



» It may be that these large palatine vacuities are not functional foramina. They have the position, 

 however, of the first pair of posterior palatine foramina, and, whatever their function, they are of consid- 

 erable generic diagnostic importance. 



