OXYSTYLA, MEXICO, ETC. Ill 



Bulimus zebra W. G. BINNEY, Terrestr. Moll, iv, p. 225, pi. 78, 



f. 12 OrihaUcus zebra BINN. & BLAND, Land and Fresh- water 



Shells of N. A., i, p. 216, f. 370 (exclusive of synonyms and fig. 

 371). Orthalicus melanocheilus, specimens from Indian Key, only, 

 CROSSE & FISCHER, Miss. Scient. Mex., Moll., p. 458 0. undatus 

 var., W. G. BINNEY, Terrestr. Moll, v, p. 410, f. 286, specimen from 

 Key Biscayne ; Man. Amer. Land Shells, p. 440, f. 483 ; Fourth 

 Supplement to Terrestr. Moll, v, Bull. Mus. Comp. Zool. xxii, no. 

 4, p. 201, pi. 2, f. 4. SIMPSON, Proc. Davenport Acad. Sci. v. p. 



67 0. melanocheilus var.floridensis PILSBRY, Proc. Acad. Nat. Sci. 



Phila. 1891, p. 317, fig. (Aug., 1891) ; Nautilus viii, pp. 37, 38, fig.; 

 p. 57. 



Not 0. zebra of Miiller or Shuttleworth ; not 0. melanocheilus 

 Valenciennes ; not 0. undatus Bruguiere. 



Closely allied to 0. undata reses, from which it differs in the absence 

 of longitudinal flames and the far smaller number of black varices. 



Quite similar to this variety are 0. melanocheilus, 0. ferussaci 

 tricincta and 0. longa strebeli of Mexico, and 0. maracaibensis imi- 

 tator of Venezuela and Colombia. They are parallel modifications 

 of various more or less diverse flammulate species. 



It may prevent confusion to place on record here the identity of 

 the specimens figured in the most used works on the United States 

 fauna. In Terrestrial Mollusks iii and v, pi. 54, the lower figure is 

 0. undata reses ; the two side figures are young 0. princeps; the 

 upper figure is unknown, the heavy columella being unlike any 

 species known to me, and very unlike undatus. In Terrestrial Mol- 

 lusks iv, pi. 77, fig. 13 is typical 0. princeps; pi. 78, fig. 12 is 0. 

 undata Jloridensis. In the Manual American Land Shells, fig. 480 is 

 0. princeps, and the paragraph at the foot of p. 439 beginning " The 

 most beautiful form of the species " also describes princeps. Fig. 482 

 is 0. undata reses ; fig. 483 is 0. undata Jloridensis, and fig. 484 is 

 correctly labeled 0. melanocheilus. In Tryon's monograph, Ameri- 

 can Journal of Conchology iii, pi. 13, f. 1 is 0. undata jamaicensis ; 

 fig. 2 is 0. undata reses ; fig. 3 is 0. longa uhdeana. I have exam- 

 ined the specimens figured. 



Mexican and Central American Species. 



a. Shell white, yellow or pale brownish with 0-3 spiral bands, no 

 longitudinal stripes except the varices, or streaks left by former 

 peristomes. 



