46 CONCHOLOGIA CESTRICA. 



whorls 3-4, strongly oblique-striate ; suture lightly im- 

 pressed; aperture rounded, or transverse; umbilicus 



Lingual Dentition of f. striatella. [Morse.] 

 Fig, 73, 



expanded, shallow; lingual membrane with 100 rows 

 of 16-1-16 teeth, each ; buccal plate arcuate, surface with 

 converging striae, and irregular notches on the concave 

 margin. H. 2^4, W. 5, mill. 



Station, under decayed bark, and leaves. New Gar- 

 den, Chester County ; frequent. 



Sub-genus STROBILA, MORSE, 1864. 



Animal of Strobila labyrinthica. [Morse.] 

 Pig, 74, 



Shell very small, turbinate, with revolving laminated 

 teeth, within both the columellar, and basal, lips ; whorls 

 numerous, strongly striate-costate ; lip simple. 



S. labyrinthica, SAY. 



Helix labyrinthica, Say, Jour. Acad. Phila. F. S., L, 

 1817. 



