194 COCHLOSTYLA-HELICOBULINUS. 



The single species contained in this group has an aspect very 

 different from the usual types of Cochlostyla. There are certain 

 forms of C. grandis Pfr., however, which present an approach to the 

 peculiar features of C. cepoides, especially in the short, twisted col- 

 umella and the numerous whorls. 



C. CEPOIDES Lea. PL 48, fig. 69. 



Imperforate, globose-turbinate, the spire short-conoid. Ground- 

 color brown above, yellowish beneath ; hydrophanous cuticle form- 

 ing a series of creamy blotches under the suture, and a band below 

 periphery. 



There are 6* narrow, closely revolving, convex whorls. The 

 base is very convex. Aperture narrowly lunar, oblique ; lip some- 

 what expanded, thickened within, brown-edged; columella vertical, 

 very short, having a strong tooth-like fold. Alt. 40, diam. 44 mill. 



Is. of Luban, Philippines. 



H. cepoides LEA, Trans. Amer. Philos. Soc. (n. ser.), vii, 1841, p. 

 462, 1. 12, f. 14. SOWB., P. Z. S. 1840, p. 88. Rv., Conch. Syst. ii, 

 1. 164, f. 14 ; Conch. Icon. f. 39. PFR., Monogr. i, p. 302 ; Conchyl. 

 Cab. t. 41, f. 3, 4. H. (Stylodonta) cepoides PFR., Nomencl. Hel. 

 Viv. p. 170. H. dolium SOWB., ined. Columpliea do Hum HART- 

 MANX, Gast. Schweiz, p. 188, t. 67, f. 1, 2. Nanina (Stylodonta) 

 cepoides TRYON, Manual of Conchology (2d ser.) ii, p. 26, t. 5, f. 

 86, 87. Cochlostyla (Ptycho stylus) cepoides MLLDFF., Nachr. D. M. 

 Ges. 1888, p. 74. 



This peculiar shell has long been classed with Stylodonta uni- 

 dentata of the Seychelles Is., but there is now no doubt that Semper 

 and Mollendorff are right in considering it a Cochlostyla. 



Section IX. HELICOBULINUS Broderip, 1840. 



Helicobulinus BROD., P. Z. S. 1840, p. 123, type H. sarcinosa. 

 Helicobulimus MOLLENDORFF, Landschn. Cebu, p. 241. Chromo- 

 cochlea HARTMANN, Gast. Schweiz, p. 137, 1844, type C. turbinoides. 

 - Chromatocochlias AGASSIZ. 



Si icll capacious, turbinate-globose, solid, variegated with green or 

 brown, covered with a variously patterned hydrophanous cuticle. 

 < 'ohimolhi more or less folded. 



This section, while closely allied to Orthostylus, presents affinities 

 with BO many groups that it must be regarded as an intermediate or 

 synthetic type. Through C. grandis it approaches the section 



