72 PLEKOCHEILUS-EURYTUS. 



B. (Plekocheilus) guildingi DOHRN, Jahrb. D. M. Ges., ii, 1875, 

 p. 306, pi. 10, f. 5, 6 ; Nachr. D. Malak. Ges., vii, 1875, p. 57. PFR., 

 Monogr., viii, p. 34. 



In the structure of columella and lip, this species is near B. auris- 

 sileni ; but the surface is said to be smoothish (Icevigata). 



Var. GUENTHERI Sowerby. PL 30, figs. 29, 30. 



Shell narrowly perforated, ovate, solid, smooth ; brown, painted 

 with irregularly angular and wavy whitish flames. Spire conic, 

 rather short, the apex a little obtuse ; whorls 4?, convex, the last 

 two-thirds the total length, inflated, rounded at base. Columella 

 nearly vertical, provided with a thickish oblique fold ; aperture 

 oval, slightly oblique, gray-brown inside ; peristome thick, reflexed, 

 the margins joined by a thickish callus. Alt. 41, diam. 26 mill. ; 

 aperture, alt. 22, width 12 mill. (Sowb.). 



U. S. of Colombia. 



Bulimvs guenth&ri SOWB., P. Z. S., 1892, p. 296, pi. 23, f. 7, 8. 



This species is remarkable for the smoothness of its surface, hav- 

 ing neither granules nor striae. In form it somewhat resembles B. 

 cardinalis Pfr., while its markings are like those of a variety of B 

 succinoides Petit. (Sowb.). Type in British Museum. 



Group of B. aulacostylus. 



Ovate, smooth, thin, umbilicated, with thin, expanded outer lip ; 

 columella broad, with a crescentic furrow at its root. 



P. AULACOSTYLUS Pfeiffer. PI. 27, fig. 98. 



Shell openly rimate-umbilicate, ovate, thin. Color varying from 

 light buff to dark red-chestnut irregularly sprinkled with chestnut 

 spots and flecks, often oblique, and on dark specimens hardly visi- 

 ble. Surface lustreless but smooth, showing under a lens delicate, 

 close, very superficial spiral strice. Spire short. Whorls 41, the first 

 with sunken tip, delicately vermiculate-striate outside ; last whorl 

 large, oval. 



Aperture long-ovate, showing the external coloring within ; peris- 

 tome thin, fleshy-purple or pale, well expanded ; columella widen- 

 ing above and at its junction with body-whorl a deep crescentic chan- 

 nel is excavated. Parietal callus a mere transparent film. Alt. 33, 

 diam. 19 mill. 



Island of St. Lucia, Wtst Indies. 



