CONCHOLOGIA CESTRICA. 



L. pentodon, SAY. 



Vertigo pentodon, Say, Jour. Acad. Phila. F. S., II., 

 1822. 



L. pentodon. [B. & B.] 



Pig, 99, 



Jaw of TJ. pentodon. [Morse.] 



Fig, 100, 



Shell ovate, umbilicate, whitish ; whorls 5 ; apex sub- 

 acute ; aperture oblique, semicircular; teeth 5, or more; 

 lip not reflected ; one prominent tooth on the pillar lip ; 

 the outer lip callous, with a series of 4 to 7 small 

 teeth; lingual membrane, with 64 rows of 10-1-10 teeth, 



Lingual Dentition of L. pentodon. [Morse.] 

 Fig, 101, 



each ; buccal plate slightly arcuate, wrinkled longitu- 

 dinally ; with the cutting edge minutely notched. H. 2, 

 nearly, W. I, mill. 



Station, among grass, and under boards and rubbish. 

 Chester County ; frequent. 



L. marginata, SAY. 



Cyclostoma marginata, Say, Jour. Acad. 

 Phila. F. S., II, 1821. 



Shell small cylindric-ovate, acute, pale 

 horn color ; whorls 6, convex, the last not 

 much enlarged, and less than half the length 



Fig, 102, 



