346 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



35). The penis sac is cylindrical, receiving the vas deferens at its summit, the 

 retractor muscle at mid-length ; the genital bladder is large, globular, on a long, 

 narrow duct ; at its entrance into the vagina there is at each side a group of 

 long, stout cylindrical caeca, the " vesica multifida," and also a dart sac ; the 

 sac is double, always consisting of one upper small, and one lower wider, 

 division, making the whole system of sacs quadripartite ; in each of these lower 

 divisions is a small, conical dart with apex slightly recurved. 



//. plebeium, var. of JiispidOy has been credited to North America by Prest- 

 wich, Quart. Journ. Geol. Soc, XXVII. 493. 



Fruticicola rufescens, Pennant. 



Shell umbilicated, subglobose-depressed, subcarinate, striate, pale reddish; 



spire moderately elevated; whorls 6, rather convex, the last 

 Fig. 230. banded with white, not deflected anteriorly ; aperture ovate-lunar ; 



peristome spreading, thickened with white at some distance within, 



the columellar margin somewhat reflected. Greater diameter 11, 



lesser 10 mill.; height, 6 mill. 



Helix mfescens, Pennant, etc., etc. — Pfeiffer, Mon. Hel. Viv., 

 I. 141. —W. G. BiNNEY, L. & Fr.-W. Sh., I. 159, Fig. 275 

 (1869). 



F,ru/eatens, ffygromia ru/escens, Tryon, Am. Journ. Conch., II. 301, PI. V, 



Fig. 1 (1866). 

 Germany, England, and other European countries. Also found at Quebec 

 probably introduced from England. It is also said by Tryon (1. c.) to have 

 been found in Canada, Nova Scotia, and Massachusetts, but I have many 

 doubts of its actually having been found at those points. 

 Jaw as described above (Lehmann, 1. c). 



Lingual membrane (PI. IX. Fig. A) with 26—1—26 teeth. The central 

 teeth have decided side cutting points, but not decided side cusps. These last 

 are developed on the laterals. Tlie change into marginals is gradual, and is 

 not formed by the splitting of the inner cutting point. My figure does not in 

 all respects agree with that of Lehmann, 1. c. 



Lehmann, in Mai. Blatt., XVI. p. 197, figures the genital system to be as in 

 hispida (q. v.). 



DORCASIA, Gray. 



Animal heliciform, as in Patula. 



Shell moderately umbilicated, globose-conoid or depressed-globose, roughly 

 striate ; whorls 4^ - 5, the last large, globose, more or less deflected anteriorly ; 

 aperture lunate-ovate; peristome thickened, reflected, its columellar margin 

 dilated and reflected. 



I hesitate to place our two species, Berlandieriana and griseola, in this genus 

 on account of the geographical range of its species being Australian, Indian, 



