HELICOSTYLA. 227 



Columella more or less folded. Type H. sarcinosa. (See pi. 53, fig. 

 2, H. turbinoides). 



This section, while closely allied to Orthostylus, presents affinities 

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

 synthetic type. 



H. grandis Pfr., vii, 195. H. turbinoides Brod., vii, 196. 



colossea Pfr. H. cinerascens Pfr., vii, 197. 



carolus Dh. v. turbo Pfr., vii, 197. 



H. sarcinosa Fer., vii, 195. H. bembicodes Pfr., vii, 198. 



v. turgens Dh., vii, 196. 



Section Orthostylus Beck, 1837. 



Orthostylus BECK (in part), Index, p. 49. MARTENS in Alb. 

 Die Hel. p. 177. v. MLLDFF., Landschu. Cebu, p. 242. Pithohelix 

 SWAINS., Malacol., p. 166. Pythohelix SWAINS., 1. c., p. 332. 



The shell is generally large, solid, ovate-conic, covered with a 

 variously patterned hydrophanous cuticle. Aperture oblique, ovate 

 lip reflexed ; columella nearly vertical, more or less obviously folded 

 below. Anatomy typical. Type H. pithogaster, pi. 53, fig. 3. 



The present section is allied to Helieobulinus, which consists of 

 more inflated shells, and to Hypselostyla, containing more elongated 

 forms. The limits of Orthostylus are not easy to determine, as there 

 are species almost or entirely intermediate between this group and 

 Helicostyla, as well as forms connecting with Hypselostyla. With 

 the exception of Mindoro and Mindanao, it occurs on all the Philip- 

 pine group. 



H. bicolorata Lea, vii, 199. H. ticaonica Brod., vii, 203. 



alberti Brod. B. subglobosus Lea. 



v. onyx Brod., vii, 199. /. lutea Pils. 



H. imperator Pfr., vii, 199. H. lignaria Pfr., vii, 204. 

 H. pithogastra Fer., vii, 200. H. gilva Brod., vii, 205. 



/. philippinensis Pfr., vii, 201. H. woodiana Lea, vii, 206. 

 ? strigata Mlldff. reevii Brod. 



/. bipartita Pils. vii, 201. reevei Pfr. 



H. villari Hid., vii, 201. H. portei Pfr., vii, 207. 



/. ventricosa Mlldff. portii Pfr. olim. 



H. daphnis Brod., vii, 201. H. rufogastra Less, vii, 207. 

 H. cunctator Rv., vii, 202. B. monozonus Pfr. 



H. faunus Brod., vii, 203. H. macrostoma Pfr., vii, 208. 



