HELICOSTYLA. 219 



Globose or elevated-oval, moderate sized or small. 



Heavy and thick, without hydrophanous cuticle, Pachysphcera. 

 Oblong, not especially heavy, color in browns, Helicostyla. 

 Oblong, suture white-bordered, color vivid, Cochlodryas. 

 Subconic, with hydrophanous cuticle, Orustia. 



Elevated and conical or turbinate, mostly large. 



Whorls numerous, equal ; columella very short with a strong fold,. 



Columplica. 

 Whorls more rapidly increasing; columella longer, Orthostylus, 



Helicobulinus. 



Elongated and bulimoid. 



Imperforate, Hypselostyla, Papustyla, Eudo.rus, Phenyus, Canis- 



trum. 

 Perforated, Prochilus, Chrysallis. 



Section Corasia Albers, 1850. 



Corasia ALB., Die Hel., p. Ill; second edit., p. 170, type H. 

 virgo. 



Shell imperforate, depressed-globose or flattened and keeled, thin,. 

 subdiaphanous ; whorls 3z-5, rapidly widening, the last hardly 

 descending in front ; lip slightly expanded or narrowly reflexed. 

 No hydrophanous markings. Type H. virgo Brod., pi. 55, fig. 12. 



Anatomy as in other Helicostylas. The shell differs from Calo- 

 cochlia in being thinner without " hydrophanous" decoration. Dis~ 

 tribution, Philippine Is., except Palawan. Arboreal. 



Group of H. regina. 



H. reginse Brod., vii, 116. H. papyracea Brod., vii, 117, 



smaragdina Grat. / aeutangula Burrow, 



v. almie Mlldff., vii, 117. H. psittacina Dh., vii, 118. I 

 v. elizabetlme Seinp., vii, 117. 



Group of H. virgo. 



H. virgo Brod., vii, 119. H. segrota Rve., vii, 124. 



H. dealbata Brod., vii, 119. H. samboanga H. & J., vii, 124. 



broderipi Rve. zamboangw Mts. 



H. patricia Pfr., vi, 196. v. intaminata Gld. 



H. casta Pfr., vii, 120. H. magtanensis Semp., vii, 12~>. 



