PORPHYROBAPHE. 159 



whorls 6, the upper ones flattened, streaked with brown, the penulti- 

 mate more convex, last whorl about as long as the spire, rounded at 

 base. Columella simple, rather straightened, white. 



Aperture slightly oblique, oval, livid, with a pearly luster inside ; 

 peristome brown-edged, UB expanded, somewhat duplicate, not re- 

 flexed. (Pfr.~) 



Alt. 83, diam. 43 mill, (from fig. of type). 



Colombia: Marmato among ferns, moss and dead leaves, in damp 

 places (Bland); Canea (Da Costa); Bogota (Wallis). 



Bulinws dennisoni REEVE, Conch. Icon., pi. 26, f. 166 (July, 1848). 

 PFR., Conchyl. Cab., p. 245, pi. G6, f. 1, 2 ; Monogr. iii, p. 380. 

 BLAND, in Adams' Contrib. to Conch., No. 11, p. 229. 



Orthalicus (Sultana) dennisoni SHUTTLEWORTH, Notitise Malac. 

 i, p. 58 (1856). PFR., Monogr. iv, 586 ; vi, 198 Of. Proc. Malac. 

 Soc. Lond. i, p. 290, and STREBEL, Beitr. Mex. Land- und Susswasser- 

 Conchyl. v, pp. 1, 2 (1882). 



Porphyrobaphe dennisoni MOUSSON, Malak. Blatter xxi, 1873, p. 

 13, with var. obscurata, p. 14. Bulimus dennisoni var. obscarata 

 Mouss., PFR., Novit. Conch, iv, p. 120, pi. 127, f. 12, 13. 



The nepionic shell is composed of two and a half smooth corneous- 

 buff whorls ; the next whorl has a subsutural band of squarish brown 

 spots. Specimens collected by Bland at Marmato are small, alt. 57, 

 diam. 34^, longest axis of aperture 36J mill., with 5J whorls, closely 

 and conspicuously decussated surface and brown lip ; the columella 

 is not straight, as in Reeve's figure, but markedly concave. This 

 form may be called var. marmatensis (pi. 48, fig.. 14). Another 

 specimen measures 59, 34, 36^ mill.; it has a tubercle at the upper 

 insertion of the outer lip, as figured for P. grevillei. I think it path- 

 ologic. 



Pfeiffer figures a small specimen of the typical form, measuring 

 alt. 71, diam. 35 mill. 



Mousson describes a variety from Bogota : var. obscurata (pi. 48, 

 fig. 13). A little smaller, alt. 71, diam. 37 mill., with elegant pat- 

 tern of black -brown lines and diffuse spots upon white bands, the lip 

 unexpanded and obtuse, grayish like the interior, not colored with 

 brown. It is darker and more copiously and elaborately figured than 

 the typical form. 



The inclusion of dennisoni among the species with "zierlich punkt- 

 formigen Griibchen " upon the nuclear whorls, by Mousson, caused 



