IGO TERRESTRIAL AIR-BREATHING MOLLUSKS. 



the last strongly carinated and deepl/ excavated towards the suture, scarcely 



„j gg descending ; aperture obli(iue, banded within ; peristome thin, 

 acute, angular, its terminations approached ; umbilicus very wide, 

 showing all the volutions. Greater diameter 12, lesser 10 mill.; 

 p. Hemphdii. height, 4 mill. 



Helix Hemphilli, Newcomb, Am. Journ. Conch., V. 1G5, PI. XVII. Fig. 4 

 (1869-70). 



A species of the Central Province, having been found in the White Pine 

 mining-district, Nevada; Manitou, Williams Canon, Colorado. 



Jaw thick, very much arched, of almost uniform breadth throughout ; striate 

 transversely and vertically; ends not attenuated, squarely truncated ; cutting 

 edge with a blunt, prominent, median projection. A stout upper muscular 

 attachment. 



P. Hemphilli (PI. IV. Fig. J) has 20—1—20 teeth on its lingual membrane, 

 with 7 perfect laterals. The first laterals are distinctly bicuspid. 



The species is viviparous. Genitalia not otherwise observed. 



Patula Idahoensis, Newcomb. 

 Shell umbilicated, globosely elevated, thick, white, rough, with stout, distant, 

 oblique, curving, blunt ribs, of which 28 are upon the last whorl ; suture im- 

 pressed ; spire highly elevated ; apex waxen, smoother, obtuse ; 

 whorls 5, convex, the last equally globose above and below, 

 hardly falling before ; umbilicus moderate, one sixth the lesser 

 diameter of the shell; aperture oblique, almost circular; peri- 

 stome simple, made almost continuous by a heavy parietal callus 

 connecting its approximating ends, that of the columella slightly 

 expanded and reflected over a portion of the umbilicus. Greater 

 diameter 13, lesser 11 mill; height, 7 mill. 



Helix Idahoensis, Newcomb, Am. Journ. Conch., II. 1, PI. I. Figs. ^ jdakoensis 

 1-3 (1866).— W.G. BiNN., L.& Fr.-W. Sh., 1.79, Fig.l38(lS69). 



Anguispira Idahoensis, Tryon, Am. Journ. Conch., II. 260 (1866). 



Idaho Territory, between Idaho City and Coeur d'Alene mining-district, in 

 the Central Province. 



The shell figured was received from Dr. Newcomb. The species in texture 

 and form resembles somewhat a small elevated Cooperi. 



The jaw very much resembles in form and in its crenellated cutting edge 

 that of Palula striatella. Its anterior surface has coarse perpendicular striae or 

 obsolete wrinkles, not well-formed ribs. There is a stout membranous attach- 

 ment to the upper margin. 



P. Idahoensis (PI. IV. Fig. I) has 33—1—33 teeth on its lingual membrane, 

 with 14 perfect laterals. The transition from the laterals to the marginals, 

 however, is very gradual. This species and IlemphilU have side cusps and cut- 

 ting points on the central and first laterals, while strirjosa does not. 



Genitalia not examined. 



