DRYM^EUS, MEXICO AND CENTRAL AMERICA. 77 



baton River (Champion); Coban (Sarg); San Joaquin, below San 

 Cristobal, in the valley of Rio Chisoy (Champion); Chacoj and Sen- 

 aim, Polochic Valley (Champion); Panzos in the same valley (Con- 

 radt and Godman). Nicaragua: La Libertad (Belt). 



Bulimus sulphureus PFR., P. Z. 8., 1856, p. 318, pi. 35, fig. 11; 

 Monogr. Helic. Vivent. iv, p. 412 Bulimulus (Drymaus) sulfureus 

 vox MART., in Albers' Die Helic., edit. 2, p. 212 Bulimulus (Dry- 

 mceus) sulphureus FISCH. & CROSSE, Miss. Scient. Mex., Mollusca, 

 i, p. 495, pi. 23, figs. 3, 3a Bulimulus sulphureus STREBEL, Beitr. 

 Mex. Land- und Susswasser-Conch., v, p. 87, pi. 5, figs. 11 a-d ; pi. 



1.3, figs. 15, 15&, 16 (radula); pi. 15, figs. 2 A-C (anatomy) Otos- 



tctnus (Drymceus) sulfureus VON MARTENS, Conch. Mittheil., ii, p. 



192; Biol. Centr. Amer., p. 225, pi. 14, f. 14-18 Bulimus mori- 



candi (Pfr.), TRISTR., P. Z. S., 1861, p. 230. 



Dr. von Martens writes of this species thus: "Animal greenish 

 (Berendt). Animal of var. citronellus white; tentacles very long ; 

 arboreal (Gabb). H. Pittier found the same variety under the bark 

 of a dead tree. 



" This species has been confounded sometimes with the white 0. 

 (ffelix) liliaceus of Ferussac (antea, p. 10), from Porto Rico. Ac- 

 cording to the specimens collected by Herr Gundlach at Quebradil- 

 las and elsewhere in this island, 0. liliaceus differs from 0. sulphur- 

 eus not only in its pure white, somewhat cretaceous color, but also in 

 the more conical form of its shell, the last whorl being less attenuated 

 beneath, more bag-like (saccatus)." As the difference is more easily 

 explained by a drawing than by description, the figures of the Porto 

 Rican shell should be referred to (pi. 13, figs. 90, 91, 92). 



"Although neither the figure in Deshayes' continuation of Fe>us- 

 sac's Hist. Nat. Moll. Terr., pi. 142 B, fig. 11, nor that given by 

 Fischer & Crosse (pi. 23, fig. 8), exhibits this difference very clearly, 

 I prefer to restrict the name liliaceus to the Porto Rican shell. Fer- 

 ussac's, fig. 14, and Fischer & Crosse's, fig. 8a, well represent 0. 

 flavidus Menke, from Venezuela : see my essay on the Land and 

 Fresh-water Mollusca of Venezuela (Die Binnenmollusken Venezue- 

 la's), p. 29 (1873). 0. virginalis Pfr., from Venezuela, common 

 near Caracas, also belongs to the same group ; it is white, and nearly 

 as slender as var. b of sulphureus, with proportionately smaller aper- 

 ture, only two-fifths of the length of the shell. Pfeiffer (Novitates 

 Conchologica?, iii, p. 422), mentions a variety of it from Chiapas, 



