408  Binmeg'n Monograph Ren elices 
were originally race is often. advanced very far 
een them. » 
i Mit .. 80. HELIX GULARIS. . 
Plate XI. fig. 1. 
H. testi convexd, sub-eleyatà, nitidà, imperforata, luteo-corneà ; 
anfractibus septem, minut? striatis ; NC simplici, acuto, intus in- 
erassato; apertura transversali, Bree duobus lamellatis interné 
armata ; basi plano. 
SYNONYMS AND REFERENCES. * 
Helix gulàris, Say. Journ, Ay. Na Philad., 
II. 156. 
- DESCRIPTION. 
Animal.. Not hitherto noticed. 
Shell. Sub-conical ; epidermis shining, pale yi 
lowish horn-color; spire tending to a point; whorls 
seven, very minute at the apex, increasing in diameter 
sieis and gradually until they reach the aperture, 
with very fine oblique striæ ; suture impressed and 
distinct; aperture transverse, not much expanded; 
lip simple, thin at its edge, within thickened ; base 
flat, indented in the centre, near the aperture yellow- 
ish-white and opake ; umbilicus small and rounded 
in young shells, obsolete or diminished to a mere 
perforation in older ones; within the aperture on the 
outer lip are two lucis. elongated, nearly parallel 
teeth, one near the base, the other more central. 
Greatest transverse diameter. more than one fodit 
of an inch. 
GEOGRAPHICAL Disrumeriov. Inhabits Pennsyl- 
