158 PORPHYROBAPHE. 



stome blunt, white or flesh-colored, expanded, becoming subreflexed 

 below ; columella vertical, straight or convex, white ; parietal callus 

 white. 



Alt. 73, diam. 39, longest axis of aperture 43 mill. 



Alt. 62, diam. 39, longest axis of aperture 39 mill. 



Colombia: La Ceja, Rio Negro (type locality) and mountains near 

 Fresno, between Salamina and Santa Ana (Bid.). 



Bulimus iris PFR., P. Z. S. 1852, p. 136; Conchyl. Cab. p. 244, 

 pi. 65, f. 4, 5 ; Monogr. iii, p. 313 ; iv, 376 ; vi, 22 DOHRN, Jahrb. 



d. D. Malak. Ges. ii, 1875, p. 298 Bulimus wallisianus MOUSSON, 



Malak. Blatter xxi, 1873, p. 9 PFR., Novit. Conch, iv, p. 135, pi. 



130, f. 7, 8 ; Monogr. viii, pp. 15, 604. B.utimus (Borus)fris H. & A. 

 AD., Gen. Rec. Moll, ii, p. 148. Porphyrobapheiris Pfr., von MAR- 

 TENS, Conchol. Mittheil., p. 174, pi. 35, f. 3 (apex). 



Similar to P. irroratus and grevillei in sculpture, but distinguished 

 by its basal keel. Dohrn has already discussed this species at some 

 length, the specimens I have seen supporting his opinion of the ex- 

 traordinarily wide swing of variation among individuals. 



Pfeiffer's original specimen was rather small, length 64 mill., with 

 the keel very near the columella, and the base, therefore, only slightly 

 distorted (figs. 28, 29). Mousson's wallisianus (figs. 31, 32) was 

 based upon a more strongly keeled shell, with very convex body- 

 whorl and brown-streaked coloring. The type measured 62 mill, 

 long ; one before me agrees exactly in color, form and size, see sec- 

 ond line of measurements above. A more aberrant, but in no way 

 pathologic individual, is shown in fig. 30. 



Dohrn gives the following extremes of size : 



Alt. 87, diam. 41, length of aperture 48 mill.; thick and calcar- 

 eous. 



Alt. 52-59, diam. 26-27, length of aperture 32-34 mill. ; thin, 

 translucent. 



GROUP OF P. DENNISONI. 



P. DENNISONI (Reeve). PI. 48, figs. 13, 14, 15, 16. 



Shell imperforate, ovate-acuminate, rather thin, subgranulated by 

 light growth striae and somewhat undulating close spiral stria?, but 

 little shining. Dull greenish buff, encircled with some pale bands, 

 marked with sparse blackish streaks and strewn with purple-brown 

 spots. Spire conic, the apex whitish, rather obtuse ; suture impressed ; 



