COCHLOSTYLA-CALOCOCHLEA . 151 



C. MATRUELIS Sowerby. PI. 48, figs. 70, 71. 



Imperforate, depressed-globose, rather thin. Ground-color brown 

 ivith three blackish bands: one below the suture, one at the periph- 

 ery, the third (occasionally absent) bounding a light yellow colu- 

 mellar tract; apex purple. Hydrophanous cuticle very thin, but 

 forming an opaque creamy band at suture and immediately below 

 the periphery. 



Spire low, apex very obtuse. Whorls slightly exceeding 4, the 

 apex slightly sunken ; last whorl descending a little in front. Aper- 

 ture oblique, livid and showing a band inside ; lip rather narrowly 

 expanded, brown ; columella very wide, brown, truncated and sub- 

 dentate below, the tooth white. Alt. 25, diam. 33 mill. 



Mindanao, Philippines. 



H. matruelis Sows. P. Z. S. 1841, p. 24. PFR., Monogr. i, p. 

 259 ; Conchyl. Cab. p. 282, t. 46, f. 10, 11. REEVE, Conch. Icon. f. 

 75. DELESSERT, Rec., t. 38, f. 4. 



Somewhat allied to C. melanocheila but smaller, the columella of 

 a different form, and the arrangement of colors diverse. 



C. DIFFICILIS Pfeiffer. PL 48, fig. 72. 



Imperforate, globose-depressed, thin, very minutely striated, shin- 

 ing, pale tawny, at the white suture banded with chestnut. Spire 

 small, semiglobose. Whorls 4?, a little convex, the last inflated, at 

 the periphery and base, banded with chestnut ; not descending in 

 front. Aperture oblique, tetragonal-lunar, white inside; peristome 

 subthickened, narrowly reflexed, the columellar margin straightened, 

 much dilated, flat, white. Alt. 26, greater diam. 42, lesser 34 mill. 



Philippines. 



H. difficilis PFR., P. Z. S. 1853, p. 127; Monogr. iv, p. 213. 

 REEVE, Conch. Icon. f. 1269. 



C. ROISSYANA Fe*russac. PL 30, figs. 23-28. 



Imperforate, subglobular, solid, compact. Surface lusterless, 

 smooth. Color either yellow, variously banded with chocolate-brown, 

 or chocolate with a light band above; the inner whorls either white 

 or purplish-blue. The hydrophanous cuticle is thin, light brown, 

 and nearly uniform, but it is usually almost entirely worn off. 



The form is globose and compact ; growth-lines light ; spiral stri- 

 ation nearly obsolete. Color very variable. Whorls 5, the last 



