8TROPHOCHEILUS-THAUMASTUS. 53 



lengthened, the apex obtuse; suture irregularly subcrenulate. 

 Whorls 6, slightly convex, the upper minutely granulose, the last 

 whorl longer than spire, oblong, slightly inflated. 



Aperture ovate-oblong, pale purplish inside, broadly edged with 

 brown-purple ; peristome slightly thickened, hardly reflexed ; colum- 

 ella rather straight. Alt. 70, diam. 35 mill. (Sowb.). 



Catamarca, Andes of Peru (S. J. DaCosta coll.). 



JBulimus salteri Sows., P. Z. S., 1889, p. 578, pi. 56, f. 4. 



Far. Hardly malleated ; sparingly radiated with brown but not 

 spotted ; striae conspicuous rugose. Alt. 86, diam. 44 mill. (SowbS). 



The typical shell has a peculiarly malleated surface, and the in- 

 dentations are rendered conspicuous by the brown markings. The 

 variety, wanting these characters, presents so different an appearance 

 that it might be taken for a distinct species. There is however, but 

 little difference in form, the coloring of the mouth is the same, the 

 brown rays are also similar in color and disposition. The longitu- 

 dinal striae are closer and more regular, taking the place of the 

 irregular indentations characteristic of the typical form (Sowb.*). 



Compare S. loxostomua Pfr. 



Group of S. thompsoni. 



Imperforate ; the nepionic shell minutely pitted, thimble-like. 

 S. THOMPSONI Pfeiffer. PI. 27, figs. 91, 92, 93. 



Shell imperforate, lengthened-ovate, solid. Yellowish chestnut 

 or olive-brown, with irregularly spaced, unequal narrow blackish- 

 brown streaks, always rather regularly striped ivith brown on the 

 upper whorls. Surface shining, smooth, with wrinkles of growth ; 

 the nepionic shell beautifully thimble-pitted, last nepionic whorl 

 striped. Spire long, apex very obtuse. Whorls 6, gently convex, 

 separated by non-crenulated sutures, margined by a white line. 



Aperture elliptic-acuminate, white or bluish inside ; peristome 

 brown, not expanded nor thickened, blunt. Columella concave or 

 nearly straight, brown or white. 



Alt. 56, diam. 28 ; aperture, alt. 28 mill, (specimen). 



Alt. 70, diam. 33 mill. (Hidalgo). 



Alt. 41, diam. 21 ; aperture, alt. 21 mill. (Pfr.). 



Nanegal (Stubel), Quito and Cuenca, Ecuador. 



B. thompsonii PFR., P. Z. S., 1845, p. 74. B. thompsoni PFR., 

 Monogr., ii, p. 141. REEVE, Conch. Icon., pi. 24, f. 158. HIDAL- 



