394 A MANUAL OF AMERICAN LAND SHELLS. 



Dorcasia g^riscola, Pfr. 



Shell umbilicated, depressed-globose, obliquely striate, sliioiug:, gray- 

 Fic. 429. i^]^ banded with red, \vliite-iiiari;iiied stripes; spire short; 

 whorls 4 to 4.^, rather convex; umbilicus very narrow; ap- 

 erture lunar; i)eristonie simple, white, reflected somewhat, 

 its columellar end rather expanded. Greater diameter 10, 

 lesser 8f "'™ ; height, 6'"'". 



D.griscola. j{gi;^, gnseola, Pfeiffkr, Symb. Hist. Hel., i. 41 ; Mou. Hel. Viv., i, 337, 

 in Chkmxitz, ed. 2, i, 34-2, ])1. Ix, figs. 17, IH. — Keeve, Con. Icon., No. 327 

 (1852).— W. a. BiXNEY, Terr. Moll., ir, .'iO, ])1. Ixxvii, fig. 20; L. & Fr.- 

 W. Sh., i, 160 (1809).— FISCHEK and Chosse, Moll. Mex. et Guat., 257 (1870). 



Helix cicercula, Ferussac, in Mas., teste Pfkiffkr. 



Helix spleiulidida, AxTOX, Verz., 36, no descr., teste Pfeiffer. 



HeJix albociiida, liiXNEY, Terr. Moll., 1,128. 



Helix albozonata, BiNXEY, in Tab.,xlix, fig. 2. 



Helix Birlandieriana, Goui.D, part, in Terr Moll., ii, 109. 



Helix alboJiiieala, Gould, Terr. Moll., iii, 34. 



Hijgromia griscola, Tryon, Am, Journ. Conch,, ii, 309 (1867). 



Dorcasia r/riscola, W. G. Bixney, Terr. Moll., v, 248. 



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

 Bosque County, Texas. In Mexico its range is wide, extending, in- 

 deed, into Guatemala 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 

 hhpicla (see p. 404). 



Lingual membrane: see generic description (p. 392). 



Genitalia unknown. 



BULiraULUS, Leach. 



Animal heliciform ; mantle subcentral ; other characters as in Patida, 

 &c. 



Shell oblong; aperture longitudinal, edentulate; peristome thin; 

 margins unequal ; columella integral. 



In the present state of our knoAvledge I think it best to leave our 

 species simply under the above generic name, without attempting to 

 group them into subgenera. As suggested by von Martens, BuUmulus 

 must eventually be restricted to those species whose dentition is like 

 that of />. Gnadchipcnfiis, the tyi)e of the genus. All of ours whose 

 dentition is now known agree with that species in this respect, except 

 B. Bormam, MarielinuSj and multilineatus. 



