COLIMACEA. MOLLUSCA. HELIX. 175 



or chestnut-colored epidermis, which is beset with very minute, 

 hair-hke projections ; aperture contracted by a deep groove be- 

 hind the hp ; lip white, narrow, reflexed, a little grooved on its 

 face, extending on the base to the umbilicus and slightly contract- 

 ing it, and its outer edge not projecting beyond the surface of the 

 whorl ; umbilicus deep, not exhibiting all the volutions, partially 

 covered by the lip ; base rounded, very much excavated at the 

 umbilical region, with a compressed, elongated white tooth at the 

 edge of the aperture. Greatest diameter nearly half an inch. 



Animal yellowish-brown, darker on the head and tentacula. 

 Foot narrow, cylindrical, half as long again as the diameter of the 

 shell, terminating in a point. Eyes black. 



Found In the middle and western parts of this State, sometimes 

 in forests with other species, but more commonly on the hill-side 

 pastures under stones, where other species rarely occur. Two 

 individuals are commonly found together. It is also found in the 

 Northern and Northwestern Slates. 



The hairy processes are most conspicuous in young shells, but are 

 often wanting at every stage of growth. The obhque lines of growth 

 are so minute, that the shell often appears quite dmooth and shining. 



■ This species and R.fraterna of Say are very similar, if not identi- 

 cal. He separates his species on account of the almost invariable 

 closure of the umbilicus, and Dr. Binney, in his " Monograph," adopts 

 Mr. Say's opinion. If they are the same, the name monodon has the 

 claim to priority. 



Helix hirsuta. 



Shell crjobular, hairy^ chestnut-colored ; aiyerivre very nurrotv ; 

 outer lip rejiexed, having o fissure on its inner margin ; pillar lip 

 with a long., compressed tooth ; umbilicus closed. 



Figure UG. 



State Coll., No. 104. Soc. Cab., 1017. 



Helix hirsuta, Say; Journ. Acad.JVat. Sc, i. 17, ii. IGI. Fe'russac ; Hist, des 

 Moll., pi. 50 A. f. 1. to 3. Deshayes ; Encyc. Mith.,Vers, ii. 253, No. 117. Lam. ; 

 .?«. sans Vert., viii. 113. Binney ; Bost. Jnurn. JVat. Hist., iii. pi. 14, f. 3. 



Helix fraterna. Wood ; Index, Suppl., pi. 8, f. IG. 



Stenotrema convexa, Rafines^ue ; 



