348 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Helix pachyloma, Menke in Pfeiffer, 1. c, I. 323; Zeitschr. f. Mai., 1847, 

 IV. 32. 



Helix virginalis, Pfeiffer, Mon. Hel. Viv., III. 132 ; I. 165 as Berlandieriana ; 

 IV. 140 ; in Chemnitz, ed. 2, I. 260, PI. XXXVIII. Figs. 18, 19. 



Hygromia Berlandieriana, Tryon, Am. Journ. Conch., II. 309 (1867). 



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

 boring portions of Mexico. 



Animal quite transparent, yellowish-white, immaculate ; eye-peduncles and 

 tentacles darker, with a dark line running back from the former quite under 

 the shell ; eyes black. 



The genitalia are figured by Leidy (1. c). The genital bladder is stout, 

 oval, on a very short duct ; the penis sac is narrow, long, tapering to the apex, 

 where it receives the vas deferens, and one part 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 griseola. 



Dorcasia griseola, Pfr. 



Vol. III. PI. XLIX. Fig. 2. 



Shell umbilicated, depressed-globose, obliquely striate, shining, grayish, 

 banded with red, white-margined stripes ; spire short ; whorls 4 to 4i, rather 

 convex ; umbilicus very narrow ; aperture lunar ; peristome simple, white, re- 

 flected somewhat, its columellar end rather expanded. Greater diameter 10,. 

 lesser 8| mill.; height, 6 mill. 



Helix griseola, Pfeiffer, Symb. Hist, Hel., I. 41 ; Mon. Hel. Viv., I. 337 ; in 

 Chemnitz, ed. 2, I. 342, PI. LX. Figs. 17, 18. —Peeve, Con. Icon., No. 327 

 (1852). — W. G. Binney, Terr. Moll., IV. 50, PI. LXXVII. Fig. 20; L. & 

 Fr.-W. Sh., I. 160 (1869). — Fischer and Crosse, Moll. Mex. et Guat., 257 

 (1870). 



Helix cieercula, Ferussac in Mus., teste Pfeiffer. 



Helix splendidula, Anton, Verz., 36, no descr., teste Pfeiffer. 



Helix albocincta, Binney, Terr. Moll., I. 128. 



Helix albozonata, Binney in Tab., XLIX. Fig. 2. 



Helix Berlandieriana, Goulp, part,' in Terr. Moll., II. 109. 



Helix albolineata, Gould, Terr. Moll., III. 34. 



Hygromia griseola, Tryon, Am. Journ. Conch., II. 309 (1867). 



A species of the Texan Subprovince, found at Indianola, and in Bosque 

 County, Texas. In Mexico its range is wide, extending, indeed, into Guate- 

 mala and Nicaragua. 



Jaw with about 10 broad, crowded ribs, denticulating the cutting margin ; 

 upper margin with membranous attachment. The jaw is somewhat of the type 

 figured by Moquin-Tandon for that of Helix hispida (see p. 347). 



Lingual membrane (see p. 34 7). 



Genitalia unknown. 



