DRYJtEUS, SOUTH AMERICAN. 237 



D. CYGKEUS (Philippi). PI. 44, figs. 92, 93. 



Shell broadly perforate, obloog-t united, densely plicate- stri ate, 

 decussated upon the upper part of the whorls by distant lines; 

 white. Whorls 6 to 7, a little convex, the last scarcely as long as 

 the spire. Aperture piriform-ovate ; colnmella slightly twisted, 

 compressed; peristome expanded, the columellar margin dilated, 

 not closing the umbilicus. Largest specimen measures : Alt. 37, 

 diam. 19 mill.; aperture, measured outside, alt. 19, width 12 mill. 



" Lomas de Supe," Peru (Raimondi). 



BuKmus cygneu* PHIL., Malak. Bl., xiv, 1867, p. 68. PFB., 

 Novit. Conch., p. 342, pi. 81, t 3, 4 ; Monogr., vi, p. 57. 



Pfeifler cites the wrong figures in the Novitates Conchologicae, 

 both in text and on the plate ; also in the Monographia. 



Seems to be near B. membranaceu* Phil., but the shell is more 

 soljd, the whorls more convex, columellar margin much longer, 

 embryonal whorls very large, etc. 



D. MEKBBANACEUS (Philippi). PI. 44, figs. 90, 91. 



Shell perforate, elongate, subconic, very thin, whitish-hyaline, 

 smooth, under the lens transversely striate, shining. Whorls 1\ 

 but little convex. Aperture semioval, patulous, shorter than the 

 spire; peristome simply expanded, the right margin arcuate, left 

 margin very broad, re flexed, with the umbilical fissure concealed. 

 Alt 15, diam. 8 lines. (PhiL). 



Habitat unknown. 



Bulimus membranaeeug PHIL., Abbild. a. Beschreib. neuer oder 

 wenig gekannter Conchylien, ii, p. 126 [22], Bui, pL 5, f. 2 (Oct- 

 ober, 1846). PFB., Monogr., ii, p. 102 ; viii, p. 69 (excl. syn.). 

 Not B. membranaeeug REEVE, Conch. Icon., pi. 75, f. 544. Not 

 Otottomug membranaeeug MABTENS, Bin nen moll. Venezuela's, p. 30. 

 ? ? Bulimulus membranaeeus BLD. & BFSN., Amer. Journ. Conch. 

 vii, 1872, p. 182. Conf. Crosse and Fischer, Moll. Terr. Mex., p. 

 559, and E. von Martens, BioL Centr.-Amer., MolL, pp. 223, 224. 



" The contour is lengthened conic, and reminds one of B. pcccihu 

 Orb. and the like. The whorls are very little convex, smooth and 

 glossy, under the lens with finely scratched transverse [spiral] lines, 

 and at the suture fine little folds of the growth-striae. The aperture 

 comprises about three-sevenths the entire length ; the peristome is 



