CONCHOLOGIA CESTRICA. 33 



T. inflecta, SAY. 



Helix inflecta, Say, Jour. Phil. Acad. F. S., II., 1821. 



Shell convex, brownish horn color, with fine, hair- 

 like, projections; whorls 5, with very T inflecta ,_ [B . & B.] 

 minute, transverse, striae ; suture not Fig, 31, 



much impressed; aperture three lobed, 

 very much contracted, by a deep groove 

 behind the lip; lip white, narrow, re- 

 flected over the umbilicus, with two 

 acute teeth on the inner margin ; the superior one in- 

 flected; the other, halfway between it and the base, and 

 separated by a profound sinus ; parietal tooth long, 

 arcuated; umbilicus covered, impressed. H. 7, W. 12, 

 mill. 



Station, mountains, Pennsylvania. 



Sub-genus STENOTREMA, RAFINESQUE, 1819. 



Shell lenticular, or depressed globose, mostly pilose ; 

 whorls 4^-6, the last gibbous; base tumid; aperture 

 long, and narrow ; basal lips white ; the superior nar- 

 rowly reflected; the inferior similar, or presenting a 

 notch, near the middle ; no umbilicus. 



S. monodon, RACKET. 



Helix monodon, Racket, Linn. Trans., Fig, 32, 

 XIII., 1822. 



Shell sub-globose, depressed above, pale 

 chestnut, minutely hairy ; whorls 5-6; aper- 

 ture arcuate, contracted, by a deep groove, behind the 

 lip, which is narrowly reflected, and 



Jaw of S. monodon. 



reaches to the base, partly, or wholly, [Morse.] 



closing the umbilicus; parietal tooth ,^2^ 



elongated; lingual membrane with 100 

 rows, of 28-1-28, teeth, each; buccal 



C 



