34 CONCHOLOGIA CESTRICA. 



plate, slightly arcuate; anterior face, with broad ribs, 

 denticulating each margin. H. 3^-4^, W. 7-10, mill. 



lingual Dentition of S. monodon. [Morse.] 

 Fig, 34. 



Station, under decayed bark and stones. Chester 

 County; rare. 



S. hirsuta, SAY. 



Helix hirsuta, Say, Jour. Phil. Acad. F. S., I., 1817. 



Shell sub-globose, pale brown, with sharp, rigid, hairs, 

 s hirsuta. arranged in oblique lines; whorls 5; aperture 

 IB. & B.J verv narrow, almost closed, by an elongated, 

 lamelliform, tooth, on the pillar lip, reaching 



from the centre of the base to within the 

 junction of the lips, above, and covering the 

 umbilicus ; outer lip narrowly reflected, 

 grooved, with a notch near the middle of its inner 

 margin ; base very convex. H. 4, W. 6, mill. 



Station, under loose bark of logs. Chester County ; 

 abundant. 



OBS. In some localities, it nearly doubles the di- 

 mensions here given. 



Sub-genus ANGUISPIRA, MORSE, 1864. 



Shell heavy, large, depressed-turbinate, solid, costate- 

 striate, banded with colored stripes; umbilicus moderate; 

 aperture simple, without teeth. 



