FRUTICICOLA. 345 



Penis sac cylindrical, receiving the vas deferens and retractor muscle at its 

 apex ; genital bladder globose, large, on a long narrow duct ; opposite the en- 

 trance of the latter into the vagina is a small sac-like receptacle for a dart. 

 The Museum of Comparative Zoology has a reversed individual. 



FRUTICICOLA, HELD. 



Animal heliciform ; mantle subcentral ; other characters as in Patula. 



Shell umbilicated or perforated ; depressed-globose, sometimes pilose ; whorls 

 5-7, rather convex ; aperture broadly lunate or lunate-rounded, peristome 

 acute, very briefly expanded, labiate within, its basal margin reflexed. 



A European genus, of which two species have been introduced within our 

 limits by commerce. 



The two species of this subgenus found within our limits, rufescens and his- 

 pida, are purely local, having been introduced by commerce at Quebec and 

 Halifax, respectively. I have not had an opportunity of ex- 

 amining the latter. The jaw of the subgenus is described as 

 arcuate with blunt ends ; anterior surface with broad, crowded 

 ribs (see figure of that of hispida copied from Moquin-Tandon) ; Jaw of p 

 Lehmann (1. c., PI. XII. Fig. 57) figures the lingual membrane 

 of hispida with centrals having a long narrow base of attachment, a stout, pear- 

 shaped, unicuspid reflection ; laterals bicuspid, marginals a simple modification 

 of the laterals. I do not find it so in rufescens (see below). Other species are 

 also figured by Lehmann. 



Fruticicola hispida, LINN. 



Shell openly umbilicated, suborbiculately depressed, horn-color, shining, with 

 short hairs ; spire convex ; whorls 5 to 6, rather convex, narrow ; 

 aperture broadly lunate ; peristome spreading, thickened with 

 white within, its basal terminus more narrow, prominent, and acute. 

 Greater diameter 10, lesser 9 mill. ; height, 5^ mill. 



Helix hispida, LINNAEUS, Syst., 675, etc., etc. PFEIFFEK, Mon. 



Hel. Viv., I. 148. 

 Hygromia hispida, TRYOX, Am. Journ. Conch., II. 308, PI. V. 



Fig. 2 (1866). 

 F. hispida. 



This is a European species, which has been found at Halifax, 

 Nova Scotia, probably accidentally introduced from England on plants. 



Moquin-Tandon figures the jaw of a French specimen as slightly arcuate ; 

 ends rounded, somewhat attenuated ; anterior surface with numerous ribs, den- 

 ticulating the concave margin. 



For dentition see above. I have not myself had an opportunity of examin- 

 ing the dentition. 



The geuitalia are figured by Lehmann (Lebenden Schnecken, PI. XJI. Fig. 



