PLEKOCHEILUS. 67 



sent. The convex fold of the columella is not added until complete 

 maturity is attained, so that some apparently adult shells are with- 

 out it ; and in this condition the species are still more alike. 



Var. LINTER.E Sowerby. PI. 31, fig. 32. 



Smaller than the type, about the size of loveni, than which it is 

 more solid, with a more produced spire and narrower body- whorl. 

 The zigzag markings are only faintly visible in some specimens. 

 (Sowb., P. Z. S., 1889, p. 582, pi. 56, ff 12). 



Mount Roraima, British Guiana. 



P. BLAINVILLEANUS Pfeiffer. PL 31, figs. 29, 30, 31. 



Shell ovate, perforated, solid ; yellowish-brown or reddish, with 

 narrow zigzag stripes. Surface ribbed on spire, the body whorl ver- 

 tically wrinkled and strongly malleated. Spire short, acute ; aper- 

 ture much over half the shell's length, brown with a pearly luster 

 within, the peristome broadly reflexed, outer lip well curved above ; 

 columella with a short callus fold built upon the middle of the 

 rather weak entering fold above. 



Alt. 58, diam. 33, alt. of aperture 36 mill. 



Alt. 43, diam. 25?, alt. of aperture 25 mill. 



Puerto Cabello, Venezuela (Swift) ; Zaji, Prov. Merida, U. S. of 

 Colombia (Funck). 



B. blainvilleanus PFR., P. Z. S., 1847, p. 230 ; Monogr., ii, p. 45. 

 PHIL., Abbild., iii, pi. 8, f. 1. REEVE, Conch. Icon., pi. 25, f. 

 161. SEMPER, Reisen im Archipel Phil., Landmoll., p. 150, pi. 

 15, f. 1 ; pi. 17, f. 4 (anatomy). B. fulminans var. blainvilleanus 

 MARTENS, Binnenmoll. Venez., p. 17. SOWB., P. Z. S., 1889, p. 

 582. 



More veutricose than fulminans, stouter, the superadded callus of 

 columella shorter. The specimen drawn in fig. 31 has not added 

 the columellar callus. 



Var. LOVENI Pfeiffer. PI, 31, figs. 36, 37. 



Shell similar to P. blainvilleana in form, but smaller, thin, the 

 riblets of penult, whorl extending upon front of body whorl; whorls 

 4?. Columella without an added callus fold. Alt. 38, diam. 23 ; 

 alt. of aperture 22 mill. 



Colony of Tovar (Dyson) ; and Puerto Cabello (Bland) ; Vene- 

 zuela. 



