CONCHOLOGIA CESTRICA. 55 
L. pentodon, Say. 
Vertigo pentodon, Say, Jour. Acad. Phila. F. S., IL, 
1822. 
L. pentodon. —[B. & B.] Jaw of L. pentodon, — | Morse. | 
Fig, 100. 
HOLY) Wy 

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 
nearly, W. 1, mill. 
Station, among grass, and under boards and rubbish. 
Chester County ; frequent. 
wy 
. - L. marginata, 
L. marginata, SAY. [B. & B.] 
Cyclostoma marginata, Say, Jour. Acad. Fig, 102, 
Philat FS: 1I., 1S20. 
Shell small cylindric-ovate, acute, pale 
horn color; whorls 6, convex, the last not 
much enlarged, and less than half the length 

