40 CONCHOLOGIA CESTRICA. 
Z. suppressus, SAY. 
Helix suppressa, Say, New Harm. 
Z. SUPPVESSUS. 
[B. & B.] Diss., I1., 1829. 
Fig, 53. 
—, Shell small, yellowish-brown, thin, 
© eae, polished; whorls 6, slowly increasing, 
fine striate above, smooth beneath; lip 
thin, callous within the base; within the outer lip are 
one, or two, elongated, lamelliform teeth; umbilicus 
very small, or absent. H. 4, W. 6, mill. 
Station, in fields, and woods, under stones, timber, etc. 
Chester County ; abundant. 
Z. internus, SAY. 
Helix interna, Say, Jour Acad; Phil P./S% Wy 1822: 
Z.internus, hell convex-orbicular, reddish brown, 
[B.& B} above ribbed, beneath smooth; whorls 8, 
narrow, suture deep; periphery sub-angular ; 
aperture transverse, narrow, thickened within, 
at the base, with two short lamellz, near the 
basal margin; lip reaching to the axis; um- 
bilicus nearly, or sometimes quite, closed.. 
H. 4, W. 6, mill. 
Station, similar to the preceding. Western Pennsyl- 
vania. 

Sub-genus HYALINA (FeErr.), GRAy, 1840. 
Animal of Hyalina cellaria.—[B. & B.] 
Fig, 55, 

Shell mostly small, umbilicate, or closed, and indented; 
depressed, vitreous, shining; whorls 5-6, increasing 
regularly ; peristome thin, acute; aperture round-lunate, 
not angled or depressed. 
