BULIMULUS. 



201 



iuner submargin, within white, with a perlaceous tinge, 

 one-fifth of an inch. Greatest breadth seven-tenths. 

 Tliis species appears to be not uncommon in Mexico, 

 as many specimens were sent me by Mr. Maclure ; 

 but from what particular locality, I know not. (Say.) 



Length one and 



Fig. 347. 



Bulimus alternatus. 

 [Say.] 



Bulimus ahernalus, Say, New Harmony Diss. Dec. 



30, 1830 ; Descr. 25 ; ed. Binxey, 39.— 



Pfeiffek, Mon. Hel. Viv. II, 221.— W. G. 



BiNNEY, Terr. Moll. IV, 120, pi. Ixxx, f. 1, 3, 18. 

 Bulimus dealbatus, Binney, part, Terr. Moll. II, 276, 



pi. lia, upper and lower fig., pi. lib. — Not Say 

 Bulimus jnaricF., Albeks, Heliceen, 162. — Pfeiffek, 



Proc. Zool. Soc. 1858, 23 ; Mon. Hel. Viv. Ill, 



350 ; in Ciiemxitz, ed. 2, 157, pi. xlviii, f. 7, 



8._W. G. Binney, Terr. Moll. IV, 128. 

 Bulimus binneyanus, W. G. Binney, Ter. Moll. IV, 128.— Not Pfeiffek. 

 Tli^umaslus alternatus, Tryon, Am. Journ. Conch. Ill, 171, pi. xiii,f. 16 ; 



pi. xiv, f. 10, excl. f. 12 (1867). 

 Thaumastus maria, Tryon, Am. Journ. Conch. HI, 172, pi. xiv, f. 3, 4, 5 



(1867). 



From Louisiana through' Texas into Mexico.' It l)eIongs 

 rather to the fauna of Mexico. Found in great numbers upon 

 bushes, the ground below them being often covered with dead 

 shells. 



This species is readily distinguished from the allied forms by- 

 its greater solidity, its highly polished 

 surface, its more elongated form, its 

 dark colored aperture, bordered with 

 the white internal margin of the peri- 

 treme, and the tooth-like callus upon 

 the upper portion of the columella. 

 It varies considerably in form, being 

 sometimes quite slender, at others quite 

 globose. In color it shows every varia- 

 tion from uniform brownish to pure 

 white. The aperture, however, is 

 always dark, and has a white, thick- 

 ened rim within the peristome. It is most attractive when orna- 

 mented with alternate white and brown longitudinal blotches. 



Fig. 348. 



Bulimulns alternatus. 



' Forbes (Proc. Zool. Soc. 1850, 54) mentions a Bulimus uUernaUi.'i ivoax 

 Panama. 



