112 COCHLOSTYLA-CORASIA. 



istome edged with brown, the upper margin not expanded, basal 

 margin narrowly expanded, columellar margin wide, flat, brown, 

 thickened within by a wide callus which is more or less abruptly 

 truncated below. 



Alt. 14, greater diam. 30, lesser 24* mill. 



San Christoval, Ugi and Santa Anna, Solomon Is. 



H. tricolor PFR., P. Z. S. 1849, p. 129 ; Conchyl. Cab., t. 124, f. 

 22-24; Monogr. iii, p. 168; 1. c. iv, p. 193. REEVE, Conch. Icon.* 

 f. 431. E. A. SMITH, P. Z. S. 1885, p. 589, (var.^cta.) 



This is a variable shell both in form and coloring. The outline 

 seen from above or below is often more oblong than the figures 

 show. The suture is white-margined, sometimes articulated with 

 brown. The circum-columellar swelling is often strongly developed, 

 often obsolete. 



Color var. White spiral lines inconspicuous ; carina white, without 

 brown border or sppts. Smaller than the type. Diam. 25-27 mill. 



Santa Anna; San Christoval. 



Color var. Similar to the last, but the white peripheral stripe 

 bordered with" brown, not articulated. 



San Christoval. 

 Color var. PICTA Smith, PL 18, figs. 69-71. 



Undulating reddish-brown stripes above and below, distinctly 

 visible within the aperture. 



Northern coast of San Christoval. 



Var. TRANSENNA Pilsbry. PI. 23, figs. 16, 17, 18, and fig. between 



2 and 5. 



Shell imperforate, depressed, low-conic above, convex beneath, 

 acutely keeled at the periphery ; thin ; translucent-whitish, having 

 numerous spiral bands and lines of opaque-white ; keel white, 

 bordered above and below with irregularly clouded brown stripes. 



Surface having light growth-lines, decussated by conspicuous and 

 close spiral striae. Spire conic, apex obtuse. Whorls 4, the last not 

 deflexed in front, its periphery slightly contracted at the aperture ; 

 base convex, not gibbous around the columella. Aperture oblique, 

 subtriangular, the peristome brown-edged, its upper margin not ex- 

 panded ; basal margin expanded, columella dilated, its face flattened 

 and having a shallow vertical groove or excavation, its inner edge 



