126 STROPHOCHEILUS. 



Borus lutescens var. cordillerce DOER., Periodico Zoologico ii, pt. 



4, 1877, p. 254. 



The spiral lines of the typical form are wanting, or very weak on 

 the first whorls only, and the peristome is a bright orange-rose color 

 throughout. 

 Var. dorbignyi (Doering). PI. 24, fig. 1. 



This is var. australis Martens (vol. x, p. 36). I do not know 

 which name has priority. Doering mentions a large form, " var. 

 maxima" length 35, width 23, and a small, " var. minima," length 

 30, width 20 mill. 



Bahia Blanca (Orb., Strobel, U. S. F. C.); Rio Sauce (Chico) 

 (Roca Exped.); interior of Patagonia (Moreno). 



Borus dorbignyi DOER., Bol. Acad. Cienc. Cord, ii, p. 336 ; Perio- 

 dico Zoologico ii, pt. 4, p. 255 (1877); Informe Oficial de la Comi- 

 sion Cientifica agregada al estado mayor general de la Expedition al 

 Rio Negro, Roca, pt. 1, Zool., p. 64, pi. 1, f. 4 (1881). 



5. CRENULATUS (Pfr.). 



BuUmus (Borus) credulatus Pfr., NEVILL, Handlist Moll. Ind. 

 Mus. i, p. 121, is a synomym. 



Subgenus THAUMASTUS Alb. (Vol. x, p. 43). 



S. GRANOCINCTUS 11. 11. 



Shell large, perforate, ovate-oblong, solid, brownish-black, orna- 

 mented with a brown band below the suture, scarcely shining, spire 

 conic with the outlines a trifle convex, apex obtuse, whitish, smooth ; 

 suture somewhat irregular, finely crenulated below, narrowly mar- 

 gined with whitish. Whorls 7, regularly increasing, the upper 

 rather flattened, striatulate, more distinctly so below the sutures ; 

 from the antepenultimate down they are more convex, roughly 

 striate, the strife more distinct below the suture, encircled throughout 

 with wide, flat lira, wider than their interstices, which are peculiarly 

 granose-scaly. Last whorl long, behind measuring three-fifths the 

 length of the shell, the base compressed around the perforation ; 

 anteriorly strongly descending for a long distance, then shortly 

 ascending. Aperture ovate, subvertical, deeply excised by the 

 penult, whorl, livid leaden-brown with a blackish border, and with a 

 silky or pearly lustre within. Peristome thickened, livid lead-brown, 

 the margins remote, connected by a thick, translucent callus, lead- 

 brown outwardly ; outer lip subangular above, then slightly pro- 



