226 HELICOSTYLA. 



Section Pachysphcera Pilsbry, 1894. 

 Pachysphcera PILS., Man. Conch, vii, p. 172 (Jan. 30, 1892). 



Shell small, globular or globose-elevated, solid, brightly colored ; 

 lacking hydrophanoas cuticle and spiral striae. Type H. sphcerica 

 Sowb. 



Confined to north-western Luzon. 



H. sphaerica Sowb., vii, 172. H. iloconensis Sowb., vii, 175. 

 H. balteata Sowb., vii, 173. v. heterotseniata Pils. 



H. annulata Sowb., vii, 174. v. xanthotseniata Pils. 



v. intensior Pils. 



Section Columplica Hartmann, 1842. 



Ptychostylus MLLDFF., Nachrichtsbl. D. M. Ges. 1888, p. 74. 

 Not Ptychostylis Gabb, a group of Trochidce. Not Ptychostylus Sand- 

 berger, Land- u. Susswasser-Conch. der Vorwelt, p. 58 (Melaniidce) 

 Stylodonta\(in part) of authors. Columplica (in part) HARTMANN, 

 Gasterop. Schweiz, p. 187, 188 (If. uniplicata and H. dolium=ce- 

 poides). Hypoptychus PILSBRY, Proc. Acad. Nat. Sci. Phila., 1892 

 p. 395, footnote. 



Shell globose-turbinate, formed of many closely coiled whorls, the 

 surface having hydrophanous cuticle ; aperture narrowly lunar ; 

 columella spirally twisted, having a strong tooth-like fold at the base. 



Animal externally like Cochlostyla, internal anatomy unknown. 



A peculiar and isolated type resembling Stylodonta unidentata 

 of the Seychelles Islands. It was first classed in Cochlostyla by 

 Semper. The name Ptychostylus being preoccupied, the writer pro- 

 posed to substitute Hypoptychus; but it seems best to revert to 

 Hartmann's Columplica. 



H. cepoides Lea, vii, 194. Island of Luban. 

 dolium Hartm. 



Section Helicobiilinus 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. turbineides. 

 Chromatocochlias AGASSIZ. 



Shell capacious, turbinate-globose, solid, variegated with green or 

 brown, covered with a variously patterned hydrophanous cuticle. 



