

HELICOSTyLA. 21 



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, Cocklodryas. 

 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, Ortkoslylus^ 

 Helicobulinus. 



Elongated and bulimoid. 



Imperforate, Hypselostyla, Papustyla, Eudoxus, Phengus, 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 3^-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. regince. 



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



smaragdina Grat. / acutangula Burrow, 



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

 v. elizabethae Semp., vii, 117. 



Group of If. virgo. 



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



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



broderipi Rve. zamboangce Mts. 



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



H. casta Pfr., vii, 120. H. magtanensis Semp., vii, 125. 



