CYLINDRELLA. 381 



Helix aspersa, Mulleb, Verm., II. 59. — Pfeiffeb, Mon. Hel. Viv., I. 241. — 



DeKay, N. Y. Moll., 47 (1843). — Binney, Terr. Moll., II. 117, not in plate. 



— W. G. Binney, Terr. Moll., IV. 51, PI. 



LXXVII. Fig. 4 ; L. & F.-W. Sh., I. 183, Fig - 266 - 



(1869). 

 Pomatia aspersa, Tbyon, Am. Journ. Conch., II. 



322, 16 (1866). 



In gardens in Charleston, South Carolina, and 

 vicinity, where it has existed for fifty years ; I 

 found it plentifully in St. Michael's churchyard 

 in 1875 ; also has been found at New Orleans 

 and Baton Rouge ; Portland, Maine ; Nova Sco- 

 tia ; Santa Barbara, California ; Hayti ; St. p a , pe rsa. 

 Iago, Chili, etc. It is a European species, ac- 

 cidentally introduced into this country, or rather by commerce as an article 

 of food. It evidently is a species peculiarly adapted to colonization. 



Jaw and lingual membrane (see above). 



Genitalia figured by Schmidt (Geschlechts. der Styl., PI. I. Fig. 5). The 

 genital bladder is small, globular, or a long narrow duct, which has a long ac- 

 cessory duct also. The sac is small, globular, on a long duct, which has at 

 about the middle of its length a much longer and stouter accessory duct. The 

 penis sac is long, cylindrical, greatly swollen at its junction with the vagina ; 

 the retractor muscle is inserted above this swelling, the vas deferens enters at 

 the apex, beyond which is an excessively long, thread-like flagellum. Opposite 

 the entrance to the penis sac is a very long, stout dart sac, above which are 

 two bundles of numerous, short, closely packed multifid vesicles. 



EXTRALIMITAL SPECIES OF POMATIA. 



Pomatia Buffoniana, Pfeiffeb, a Mexican species, has been erroneously quoted 

 from Alameda County, California. It is figured on PI. LXIII. of Vol. III. 



(3) Jaw with delicate, distant ribs to its anterior surface, usually running 

 obliquely to the median line. 



CYLINDRELLA, Pfeiffer. 



Animal heliciform, blunt and short before, rapidly attenuated behind ; mantle 

 slightly posterior, simple, thin, protected by an external shell ; respiratory, anal, 

 and genital orifices as in Patula ; no caudal pore, no distinct locomotive disk. 



Shell cylindrical or pupaeform, multispiral, generally truncated ; with re- 

 markable differences in the form of the axis, often furnished with revolving 

 laminae or other curious processes ; aperture subcircular, edentulate ; peristome 

 expanded, continuous. 



A West-Indian genus, represented only in the Florida Subregion within our 

 limits. 



