h. s 
A 
aut 
416 Binney's Monograph of the Helices 
à ture rather large, transverse ; lip simple, very thin, 
 atits inferior extremity terminating at the centre of 
the base of the shell; umbilicus none, but theu um- 
bilieal region is Pond. 
Greatest transverse diameter more than one ‘fit 
of an inch. “tee 
Gerocraruican. Disrrisution. —Inhabits. Massas 
chusetts, New Jersey, Pennsylvania, and bias an 
is probably a wide-spread species. 
Remarks. This shell is found in the same situa- 
tions as Hexix arborea, Sax, and resembles it very 
much, particularly on its upper surface. It may, be 
distinguished from it by the outer whorl, which is 
more spread towards the aperture, by the impressed 
radiating lines, and by the want of an open umbili- 
cus. The whorls in this species usually revolve in 
such a manner as to leave no opening between them, 
but there is an occasional specimen with a well- 
formed umbilicus. ix ‘ 
€ 
35. HELIX CHERSINA. - 
Plate XXVI. fig. 3. 
H. testà minimA, sub-conicà, tenuissimá, pellucida, imperforatà ; 
aperturá transversà; labro simplici, acuto; basi convexo. | 
SYNONYMS AND REFERENCES. 
«A chérsina, Say.. Journ. A. N. S. Philad., 1. 
156. Exped. St. Peter’s River, Ul. 258- 
DESCRIPTION. 
Animal. : Not observed. 
