28 DKYM.EUS, WEST INDIES. 



Biilimtilns (Mesembrinns) ttuiltilineatns BINNKY & BLAND, Land 

 aii'l Fresh-water Sliells of N. A., i, p. 197, fig. 344 FISCH. & 

 CROSSE, Miss. Scient. Mex., Mollusca, i, p. 545. Jinlinntlns nntl- 

 tilineatus BINNKY, Terr, air-breath. Moll, of N. A. v, p. 395 ; 

 Manual of Am. Land-Shells, p. 404, fig. 443 DALL, Proc. U. S. 

 Nat. Mus. 1885, p. 260 GIBBONS, Journ. of Conch. (Leeds), ii, 

 p. 13G. Bulimiis menkei, GRUNER in AViegm. Arch. f. Naturg. 1841, 

 p. 277, pi. 11, fig. 2. PKR. Monogr. Helic. Vivent. ii, p. 17(> ; 

 Martini & Chemnitz, Syst. Conch. -Cab. ed. 2, Bnlinws, p. 190, 

 pi. 49, figs. 19, 20 Bvlimus (Mesembrimis) menkei ALBERS, Die 



Helic, ed. I, p. 157 PER. in Malak. Blatt. ii, p. 158 (1855) 



Bvlinwlm (Mesembrinus) menkei, YON MART, in Albers' Die Helic. 

 ed. 2, p. 214 Otostomits (Mesembrinns] menkei, MART., Binnen- 

 moll. Venezuela's p. 28 ; Biol. Centr. Amer. Moll., p. 235. Mesem- 



brimis menkei Jouss., Mem. Soc. Zool. France, ii, p. 241 Bulimus 



stsahnsis MOREI.ET, Test. Noviss. i, p. 9 (1849), ii,p. 27. Bullmns 

 venosus REEVE, Conch. Icon, v, Biiliimts, pi. 45, fig. 285 Bulimus 

 virgulalus (Ferussac), LEIDY, in Binney's Terr. air- breath. Moll, of 

 N. A. i, p. 259, pi. 15, figs. 7, 8 (anatomy). BINNEY, op. cit. ii, p. 

 278, pi. 58. Bulimiis parvvs LEA, Trans. Amer. Philos. Soc. vi, 

 p. 84, pi. 23, f. 96 (June, 1838) ; Obs. Gen. Unio, ii, p. 84, pi. 23, 

 f. 96. 



The geographic range of this species is remarkably discontinuous, 

 but with large series before me from Venezuela, Colombia and Flor- 

 ida, I am compelled to agree with von Martens and others that no 

 specific separation is possible. There are, however, one or two in- 

 cipient subspecies in South America. These are too ill-defined to 

 deserve names, but as the tendency toward differentiation exists, I 

 have below used the names already given. The South American 

 forms are doubtless the parent stock, and the Floridian probably a 

 colony introduced by some "accidental" or rarely efficient agency. 



The typical Floridian form always lias the earlier whorls dark blue 

 with a light sulisiitiiral border, and the color-] at tern of the whole i-hell 

 is well developed. Some South American shells (form menkei Grime r, 

 pi. 11, fig. 33) also show these characteristics ; but the majority have 

 the earlier portion of the spin- white or rose- tin ted, and very fre(|iiently 

 the color-pattern throughout is weaker, spiral bands ah.-ent (tig. 31) 

 or all the streaks lost except a few on the latter part of the last whorl 

 (fig. 30, Yaracui, Venezuela). 



