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 24-1 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; L c. iv, p. 193. REEVE, Conch. Icon., 

 f. 431. E. A. SMITH, P. Z. S. 1885, p. 589, (var. picta.} 



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 spots. 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 



