PORPHYROBAPHE. 157 



outlines somewhat concave. Whorls 5J to 6, convex, the earlier 

 three smooth, uniform yellowish or flesh-colored, last whorl well 

 rounded throughout. 



Aperture but slightly oblique, ovate; white and showing some 

 purplish mottling within; peristome pure white, reflexed and re- 

 curved, widest below, having a slight or decided tubercle on its face 

 at the insertion above, outward from which there is a slight sinus; 

 columella concave, hardly folded, white, narrow in the middle ; 

 parietal callus white, thin inside, thickened into a low nodule or 

 ridge near the posterior angle of the mouth. 



Alt. 60, d.iam. 35, longest axis of aperture 36J mill. 



Alt. 67, diam. 44 mill. (Pfeiffer's type). 



Quito, Ecuador (Cuming). 



Bulimus grevillei Sowerby, PFR., Novit. Conch, iv, p. 143, pi. 133, 

 f. 4, 5 (1876) ; Monogr. viii, p. 15 (1877). Dryptus yrevillei Sow., 

 MILLER, Malak. Blatter, xxv, 1878, p. 180. 



This species is closely allied to P. irroratus, differing therefrom 

 chiefly in the light coloration, less folded columella and wider basal 

 lip. The tubercle at the insertion of the outer lip (see fig. 39) is 

 not constant, being very low in a specimen before me received from 

 Cuming. Perhaps the shallow sinus or bay in the lip near the in- 

 sertion, may prove more constant; but it is not unlikely that grevillei 

 may prove to be a variety of the older and variable irroratus. 



P. grevillei differs from P. iris and P. wallisianus in being rounded 

 beneath, not keeled. 



The locality "Quito" rests upon the authority of Cumingian 

 labels only. Wolf, Boetzkes, Stiibel, Cousin, Paz and other collec- 

 tors in Ecuador do not seem to have encountered the species. 



P. IRIS (Pfeiffer). PI. 51, figs. 28, 29, 30, 31, 32. 



Shell ovate-acuminate, moderately solid and strong. White under a 

 bright yellow or tawny-brown streaked cuticle, paler or white on the 

 spire and basal keel. Surface slightly sinning, coarsely, irregularly 

 plicate or vlicatulate, decussated by rather wide-spaced spiral furrows 

 or lines, cutting the folds into spiral bands of oblong granules. 

 Whorls 5J, the first 2^ forming the nearly smooth, obtuse nepionic 

 shell, the next whorl rather flattened, penultimate and last whorls 

 convex, the latter having a prominently exserted, blunt keel on the base. 



Aperture irregularly ovate, slightly oblique, white within ; peri- 



