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 ; 

 hi eking hydrophanous cuticle and spiral stride. Type H. sphcerica 

 So\vb. 



Confined to north-western Luzon. 



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

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



H. annulata Sowb., vii, 174. v. xanthotteniata 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 Saud- 

 berger, Land- u. Siisswasser-Couch. der Vorwelt, p. 58 (Melaniidci) 

 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 

 Hartmaun's Columplica. 



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

 dolium Hartni. 



Section Helicobulinus Broderip, 1840. 



Helicobullnus 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. 

 (Jhromatocochlias AGASSIZ. 



Shell c:\pacious, turbinate-globose, solid, variegated with green or 

 brown, covered with a variously patterned hydrophanous cuticle. 



