28 DRYM^US, WEST INDIES. 



Bulimulus (Mesembrinus) multilineaius BINNEY & BLAND, Land 



and Fresh-water Shells of N. A., i, p. 197, fig. 344 FISCH. & 



CROSSE, Miss. Scient. Mex., Mollusca, i, p. 545. Bulimulus mul- 

 tilineatus BINNEY, 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. 136. Bulimus menkei, GRUNERin Wiegm. Arch. f. Naturg. 1841, 

 p. 277, pi. 11, fig. 2. PFR. Monogr. Helic. Vivent. ii, p. 176 ; 

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

 pi. 49, figs. 19, 20 Bulimus (Mesembrinus) menkei ALBERS, Die 



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



Bulimulus (Mesembrinus^) menkei, VON MART, in Albers' Die Helic. 

 ed. 2, p. 214 Otostomus (Mesembrinus) menkei, MART., Binnen- 

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



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



sisalensis MORELET, Test. Noviss. i, p. 9 (1849), ii,p. 27 Bulimus 

 venosus REEVE, Conch. Icon, v, Bulimus, 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. Bulimus parvus 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 has the earlier whorls dark blue 

 with a light subsutural border, and the color-pattern of the whole shell 

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

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

 the earlier portion of the spire white or rose-tinted, and very frequently 

 the color-pattern throughout is weaker, spiral bands absent (fig. 31) 

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

 (fig. 30, Yaracui, Venezuela). 



