DRYM^EUS, SOUTH AMERICAN. 309 



slightly convex ; peristome simple, acute; columellar margin reflexed. 

 Alt. 18-20, diam. 10, length of aperture 9 mill. (Dr.). 



Ilet-la-Mere, French Guiana, oil tree trunks (Eyries). 



Bulimus rufolineatus DROUET, Essai sur les Moll, terrestr. et fluv. 

 de la Guyane Fran9aise, p. 61, pi. 1, f. 10, 11 (1859). PFR., Mon- 

 ogr., vi, p. 116. 



Differs from D. imperfectus of Trinidad in having three or four 

 instead of five bands. It is allied to Antillean rather than to con- 

 tinental species. 



Group of D. virginalis. 



Rather thin, yellow or white one-colored shells with acute per- 

 istome. The following Colombian and Venezuelan species are 

 closely^ allied to D. litiaceus and its allies of the Antilles, and D.sul- 

 phureus and related forms of the middle American mainland, all 

 being doubtless of common origin. They are also closely allied to 

 the preceding group. 



D. VIRGIXALIS (Pfeiffer). PI. 26, figs. 83, 84, 87. 



Shell perforate, oblong-turrited, thin, nearly smooth (very finely 

 decussated, under the lens), subpellucid, whitish ; spire long-conic, 

 the apex buff, acute ; whorls 7, but a trifle convex, the last about 

 three-sevenths the total length, subcompressed at base. Columella 

 lightly arcuate. Aperture slightly oblique, oblong; peristome 

 simple, thin, the right margin slightly arcuate, narrowly expanded, 

 columellar margin dilated and reflexed. (Pfr.). 



Alt. 26, diam. 12, length of aperture 12i mill. 



Alt. 29, diam. 13, length of aperture 13 mill. 



Alt. 27, diam. 12, length of aperture 12 mill. 



Caracas, Venezuela (Klocke, Lansberg, and others), and near the 

 mouth of the river Yaraqui (Hellyer, in Swift coll.). 



Bulimus virginalis PFR., Malak. BL, iii, p. 46 (1856) ; Monogr., 

 iv, p. 405 ; Novit. Conch., iii, p. 422, pi. 96, f. 1, 2. Otostomus (Mor- 

 mus) virginalis MARTENS, Binnenmoll. Venez., in Festschr. zur Feier 

 100-jahrigen Bestehens der Ges. naturforsch. Freunde zu Berlin, p. 

 184, pi. 1, f. 5 ; also pi. 2, f. 21 a-f, teeth and jaw, by Schako. Bulim- 

 ulus virginalis STREBEL, Beitr. Mex. Land- und Siisswasser-Conch., 

 v, p. 88, pi. 12, f. 14 (shell), pi. 15 ; f. 4a-d (anatomy). 



Considerably like D. liliaceus in general appearance. It is thin, 

 white or of a very pale yellow tint, often with bluish streaks; the 



