1915.] 



GEIOJS KEihlOTRICHUS. 



93 



underfur less clearly defined. Mammae, 8: latero-pectoral. 2-2; 

 latero-abdominalj 1-1; inguinal, 1-1. 



Slceletal characters. — Clavicle relativelY long and narrow (for the 

 Talpid^e), length, about twice the breadth; concaYe superiorly, infe- 

 rior surface with a flat process projecting postero-later- 

 ally; not penetrated by a foramen. Humerus about 

 three-fifths as broad as long, weaker medially (as in 

 Condylura) . Pelvis narrow, bones of opposite sides sep- 

 arated by considerable space (about 2 mm.) under aceta- 

 bula; no osseous bridges connecting sacral vertebras with 

 ischium. Superior surface of last sacral vertebra with- 

 out process. Os falciforme rudimentary and scarcely 

 perceptible. 



Skull conoidal, moderately depressed, without promi- 

 nent processes and ridges, with moderately broad brain- 

 case, scarcely constricted interorbitally. Mastoids weak. 

 Interparietal large, broad, irregularly semicircular, ante- 

 riorly deeply emarginate medially, posteriorly shghtly 

 emarginate and usually without a posterior median pro- 

 jection. Frontal region scarcely sloping ventro-anteri- 

 orly; frontal sinuses very shghtly swollen. Rostrum 

 moderately elongate; anterior ends of premaxillae not 

 much thickened, extending beyond nasals, forming a 

 somewhat truncate notch anterior to the nasals. Ante- 

 rior nares opening forward. Zygomata short, narrow, 

 slightly out-curved, directed shghtly downward anteri- 

 orly, the posterior end for^vard on squamosal (less so 

 than in Condylura) . Foramen magnum eUiptical, relatively large. 

 Infraorbital foramen large, the plate forming its outer wall relatively 

 broad and heavy. Audital bullae incomplete; no auditory meatus. 

 External pterygoid region scarcely inflated (relatively more than in 



Condylura). Mesopterygoid space moder- 

 ately long and broad, the sides usually gent- 

 ly concave. Palate moderately elongate, 

 relatively narrow, terminating opposite pos- 

 terior border of last molar; posterior border 

 of palate shghtly emarginate, without spine 

 or notch. Anterior palatine foramina mod- 

 erate, oval; first pair of posterior palatine 

 foramina moderate, oval to elliptical-oval; second pair minute. Hor- 

 izontal ramus of mandible slender, nearly straight; coronoid rela- 

 tively long, erect proximally, curving posteriorly distally into an 

 acute process; angle of mandible relatively short and narrow 

 (smaller than coronoid) ; inferior mandibular notch relatively shallow 

 and broad. 



B2030-10.3 

 Fia. 24.— Tail of 

 Xeil rotriclius 

 gibisii liyacintli- 

 inu-s{Xl\). No. 

 160S98, r. S. 

 Xat. Mus., Bi- 

 ological Survey 

 collection; from 

 Aptos, Cal. 



B2031-103 



Fig. 25. — Snout of XeurotricJius 

 giibsii giibsii (Xlf). Xo, S34dS, 

 U. S. Xat. Mus.; from Britisli 

 Columbia. 



