BULIMULUS-PLECTOSTYLUS. 7 



Very like B. ochsenii Dkr., differiDg in the umbilical chink, dis- 

 tinct granules, non-papillose suture, smaller proportionate size of 

 the aperture, more obtuse apex, stronger columella and narrower 

 aperture. (Dkr.'). 



B. PERUVIANUS (Bruguiere). PI. 7, figs. 96, 97, 98, 99. 



Shell imperforate, oblong, rather solid ; white, unicolored, irregu- 

 larly stained or clouded, or with several wide purple brown bands 

 or longitudinal streaks under a yellow cuticle usually more per- 

 sistent in numerous spiral lines ; sculptured with coarse irregular 

 longitudinal whitish wrinkles, and usually having many narrow 

 spiral bands composed of fine vertical wrinkles or pits, the apical 

 whorls with dense and very fine undulating striae. Spire short, 

 convex-conic, ratheracute ; suture irregularly denticulate. Whorls 

 5?, at first slowly and then rapidly descending, the latter 2 convex* 



Aperture long, acuminate-ovate, purple-rose and white within 

 sometimes dark-maculated ; peristome slightly thickened inside, no' 

 expanded ; columella with a conspicuous cord-like, spirally entering 

 convex fold above, its margin reflexed and appressed ; parietal ivalt 

 with a thin rose-purple callus. 



Alt. 45, diam. 22 mill. ; aperture 26 mill. long. 



Alt. 42, diam. 20 mill.; aperture 22 mill. long. 



Chili: Concepcion, Quillota (King) ; Valparaiso (Orb., Paz and 

 Martinez). 



Bulimus peruvianus BRUG., Encycl. Meth., i, p. 320. GRAY, 

 Spicil. Zool., pi. 5, f. 4. ORB., Voy., p. 267. HOMBRON & JACQ., 

 Voy. au Pol Sud, v, p. 30, pi. 8, f. 2. PFR., Monogr., ii, p. 166. 

 DESK, in Fer.,Hist., ii, (2), p. 75, pi. 114, f. 1-4. REEVE, Icon., 

 pi. 17, f. 101. HIDALGO, Viaje al Pacif., p. 102. HUPE, in Gay, 

 Hist. Chile, p. 100, pi. 1, f. 2. Helix (Cochlostyla) peruviana FER., 

 Prodr. no. 334. Plectostylus peruvianus BECK, Index, p. 58. 

 FFLD., Verh. Zool.-bot. Ges. Wien, xix, 1869, p. 875. BINNEY, 

 Ann. N. Y. Acad., iii, p. 124, pi. 12, f. J (dentition).- Bulinus cor- 

 rugatus KING, Zool. Journ., v, p. 341. Bulinus gravesii KING, Zool. 

 Journ., v, p. 340. Sows., Conch. Illustr., f. 12, 12*, 12**. 

 ? Plectostylus pulicarius BECK, Index, p. 58 (incorrect reference to 

 Gray's Sp. Zool.? Referred by Pfr. to Bui. piperitus, in Nomencl. 

 Hel. Viv., p. 227). 



Variable to an unusual degree in coloring, contour and sculpture. 

 Some specimens have three wide interrupted purplish bands; others 



