220 HELICOSTYLA. 



H. puella Brod.. vii, 120. H. intorta Sowb., vii, 125. 



v. lais Pfr., vii, 121. v. crassa Mlldff, vii, 125. 



v. subpuella Pils., vii, 121. v. siquijorica Mlldff., vii, 125. 



H. irosinensis Hid., vii, 121. H. limansauensis S., vii, 126. 



H. seruginosa Pfr., vii, 122. H. sphserion Sowb., vii, 154. 



H. filaris Val, vii, 122. /. intincta Shutt., vii, 154. 



v. nympha Pfr. v. nana Semp., vii, 155. 



v. tennis Mlldff., vii, 126. v. crassilabris Mlldff. 



v. expansilabris Mlldff., vii, v. meridionalis Mlldff. 



126. H. saranganica Mlldff., viii, 245. 



H. eydouxi Hid., vii, 123. H. globulosa Mlldff., Nachr., '95, 



valenciennesii Pfr., not Eyd. 96. 



H. broderipi Pfr., vii, 123. H. loheri Mlldff, Nachr., '94, 115. 



Section Crystallopsis Ancey, 1887. 



Crystallopsis ANC., Conchol. Exch., ii, p. 23, types H. hunteri and 

 allasteri. 



Shell thin, depressed globose or depressed and keeled, translucent 

 whitish or banded, the axis perforated, at least in the typical forms. 

 Surface spirally striated ; lip expanded. Type H. hunteri Cox. 

 See pi. 55, figs. 10, 11, H. tenimberiea Mlldff. 



Jaw (of H. conformis) semicircular, perfectly smooth. Radula 

 as in Helicostyla. 



Genital system (Frontispiece, fig. 4, H. conformis) as in Helicostyla. 



The shell is similar in general features to Corasia, but the jaw of 

 H. conformis has been shown by Tapparone-Canefri to be smooth 

 (Ann. Mus. Civ. Genov., xix, pi. 8, f. 1, 8, 15). Distribution, Solo- 

 mon Is. to Moluccas. 



Group of H. lactiflua. 



H. huuteri Cox, vii, 105. H. wisemani Braz., vii, 109. 



H. allasteri Cox, vii, 106. H. aphrodite Pfr., vii, 109. 



allisteri Pils., typ. err. H. anadyomene Ad. & Ang., vii, 



H. aggei Heimb., viii, 244. 110. 



H. subvitrea Pfr., vii, 107. H. psyche Aug., vii, 110. 



H. cymodoce Cr., vii, 107. H. balcombei Cox, vii, 111. 



H. lactiflua Pfr., vii, 108. H. woodfordi Sowb., viii, 243. 



isabellensis Souv. H. tricolor Pfr., vii, 111. 



H. purchasi Pfr., vii, 108. v. picta Sin., vii, 112. 



H. rossiteri Ang., vii, 109. v. transenna Pils., vii, 112. 



H. tenimberiea Mlldff, viii, 244. 



