DRYM^US-BULIMULUS. 317 



With the form of D. nigrolimbatus, this species is smaller, without 

 the subgranulose spiral lines, and of a different color. 



D. TAPADOIDES (Philippi). PI. 46, figs. 59, 60. 



Shell subimperforate, oblong, very thin, somewhat plicate ; olive- 

 green, the folds whitish. Whorls 4?, the last a little longer than 

 the spire. Aperture semi-ovate; columella thread-like, receding; 

 peristome unexpanded. very thin ; columellar margin a little dilated 

 above, very thin, almost completely closing the perforation. Alt. 

 18, diam. 10 mill. ; alt. of aperture 10, width 5i mill. (Phil.). 



Tarma, Peru (Isern). 



Bulimus tapadoides PHIL., Malak. BL, xiv, 1867, p. 71. PFR., 

 Novit. Conch., p. 338, pi. 80, f. 14, 15 ; Monogr., vi, p. 89. 



Apparently allied to D. colmeiroi Hid. 

 D. IGNOBILIS (Philippi). PL 46, figs. 57, 58. 



Shell imperforate, ovate-turrited, slightly striatulate ; white, with 

 some rufous-corneous blotches and streaks. Apex obtuse; whorls 

 6, rather flat, gradate, separated by a deep suture, the last whorl 

 rounded, ventricose, about equalling four-ninths the total length. 

 Aperture ovate-oblong, columella thread-like, twisted, receding ; 

 peristome unexpanded, acute, a thin callus joining the margins and 

 covering the umbilical region. Alt. 25?, diam. 18 mill.; alt. of 

 aperture 12J, width 6J mill. (Phil.'). 



Chanchamayo, Pent (Raimondi). 



Bulimus ignobilis PHIL., Malak., BL xiv, 1867, p. 72; Novit. 

 Conch., p- 340, pi. 80, f. 21, 22; Monographia, vi, p. 106. 



The embryonal whorls are pale corneous, and under the lens are 

 seen to be strongly, though finely, punctulate. The rest of the shell 

 shows malleation in places. 



APPENDIX TO VOL. XI. 

 B. COR^FORMIS Pils. (p. 15). 



A better figure of the apical sculpture is given on pi. 26, fig. 85. 



Subgenus PLECTOSTYLUS (p. 2). 

 B. PUNCTULIFER (Sowerby). PL 26, figs. 67-69 ; pi. 8, fig. 27. 



Shell ovate-oblong, subacuminate, whitish, most minutely rugu- 

 lose, covered with a very thin yellowish cuticle, sparsely ornamented 



