136 PROCEEDINGS OF THE ACADEMY OP 



Patula cooperi, W. G. Binn. 



Lingual membrane as in Patula sfrigosa. 



Patula idahoensis, Newc. 



Tlie javv very much resembles in form and in its crenellated 

 cutting edge that of Patula striatella. (See fig. 141 of L. and 

 Fr. W. Shells, part I.) Its anterior surface has coarse perpendicu- 

 lar striae or obsolete wrinkles, not well formed ribs. There is a 

 stout membranous attachment to the upper margin. Lingual 

 membrane as in Patula Hemphilli. (See Am. Journ. of Couch., 

 VL 24t.) 



Patula perspectiva, Say. 



The jaw and lingual membrane are quite like those of P. stria- 

 tella. The ends of the jaw, however, are more squarely truncated, 

 and the strife are not converging. 



Helix polygyrella, Bland. 



Jaw slightl}' arcuate, ends but little attenuated, blunt; anterior 

 surface with fifteen broad ribs, denticulating either margin. 



Lingual membrane as in H. auriculata. 



We are indebted to Mr. Harford for the living specimens from 

 which the notes on this species are drawn. 



Helix palliata, Say. 



Jaw short, high ; anterior surface with more than fifteen ribs, 

 denticulating either margin. 



Helix obstricta, Say. 



Jaw with ten ribs. Lingual membrane as in H. palliata. 

 Helix devia, Gld. var. 



This small, doubtful form from Salmon River, Idaho, has the 

 jaw arcuate, ends blunt, with about seven stout ribs denticulating 

 either margin. The lingual membrane is broad, teeth as usual in 

 the genus, the marginals low, wide, with one oblique, bluntly 

 bifid, inner denticle, and several short, blunt, outer denticles. 



Helix pidelis, Gray. 



In Amer. Journ. Conch., VL p. 207, pi. ix. fig. 1, we described 

 and figured thejaw as short, high, thick, rough, strongly arcuate, 

 ends attenuated, blunt, cutting edge with a well developed, blunt, 

 median projection, marked with decided longitudinal strife, which 

 crenellate its margin. We have lately had an opportunity of 

 examining numerous other adult specimens, and find them decid- 



