EASTERN PROVIiSCE — SOUTHERN REGION SPECIES. 393 



.'iiiiile of the base of attacliincnt and inner side cuttinj^ point. Margi- 

 nals low, wide, the retiection broad, equaling the base of attachment 

 and bearing one inner, broad, long, oblique, bitid cutting :)oiut, the 

 inner division the smaller, and two outer, smaller, stout, sharp, side 

 cutting points. D. Ikrhindieriana has the same dentition. 



Dorcaisia Bcrlaiidieriana, Moricaxd. 

 Shell perforated, globose, thin and translucid, scarcely striated, 

 shining, and with a somewhat silken or opaline luster, pale Fir..428. 

 yellowish-green, sometimes nearly colorless, and generally 

 having a faint, narrow, brownish band around the posteiior 

 third of the last whorl ; spire consisting of 5 well-rounded 

 Avhorls, separated by a deeply inqjressed suture, the last 

 whorl broadly rounded at the periphery, contracted at the 

 aperture, which is small, ciescentric, with a white, polished, 

 roundly reilexed peristome, presenting a sharp inner edge to the in- 

 terior; the peristome is somewhat angular near its posterior junction, 

 and at this part the shell is thickened within with callus and is opaque 

 white; base rounded and perforated by a minute umbilicus. Greater 

 diameter 13, lesser 10"^"' ; height, 8""". 



Helix BerJandieriana, Moricaxd, M6m. de S. Pbys. et d'Hist. Nat. de Geneve, vi, 537, 

 pi. i, fig. 1 (lrt3'J).— Desha YES, in Lam., Au. sans Vert., viii, 133; ed. 3, iii, 

 316.— Leidy, T. M. U. S., i, 255, pi. ^^iii, fig. 11 (IriSl), aiiat.— Bixxey, Terr. 

 Moll., ii, 109, pi. xlix, fig, 1.— \Y. G. Bixxey, Terr. Moll., iv, i)l.lxxvii, fig. 

 22; L. & Fr.-W. Sb., 1, 159 (186U).— Pfeiffer, Mon. Hel. Viv., iii, 227 (uot 

 i); iu Chemxitz, cd. 2, ii, 275, pi. cxxiii, figs. 15-18. — Ri;evk, Cou. Icon., No. 

 708 (18.52).— Fischer and Crosse, Moll. Mex. et Giiat., 2515 (1870). 



Helix jmchiiloma, Mexke, iu Pfeiffer, 1. c, i, 323; Zeitschr. f. Mai., 1847, iv, 32. 



Htiix virqinalis, Pfeiffer, Mon. Hel. Viv., iii, 132; i, \(Ji>, as Berlandieriana ; iv, 140; 

 iu Chemxitz, ed. 2, i, 260, pi. xxxviii, figs. 18, 19. 



Hiifjromia Berhindieriana, Tryox, Am. Journ. Conch., ii, 309 (18G7). 



Dorcakia Birlandieriava, W. G. Bixxey, Terr. Moll., v, 247. 



A species of the Texan Subregion, found in Arkansas, Texas, and 

 the neighboring portions of Mexico. 



Animal quite transparent, yellowish-white, immaculate ; eye-pedun- 

 cles and tentacles darker, with a dark line running back from the 

 former quite under the shell ; eyes black. 



The genitalia are figured by Leidy (/. c). The genital bladder is 

 stout, oval, on a very short duct; the penis sac is narrow, long, taper- 

 ing to the apex, where it receives the vas deferens and one i)art of the 

 double retractor muscle, the other being attached at about mid-length; 

 near the base of the penis sac is a long, cylindrical organ, probably a 

 dart sac. 



Lingual membrane as in griscola. 



