48 COCHLOSTYLA-FROCHILUS. 



Var. LARVATA Brod. PI. 15, fig. 10. 



Shell more elongated, coloring of the external surface continued 

 upon the reverse of the lip, forming a colored rim on the lower 

 external edge. 



Island of Cuyo. 



C. VIRGATA Jay. PI. 16, figs. 11, 12, 13, 14, 15 ; pi. 17, fig. 35. 



Narrowly perforated, turrited, solid ; the spire slender. Ground- 

 color yellow, usually having two or three broad brown zones, and 

 frequently variegated with oblique stripes of cream-colored hydro- 

 phanous cuticle. Whorls 5, rather convex ; aperture almost half 

 as long as the shell, oblique ; peristome very broadly expanded and 

 reflexed ; columella roundly reflexed ; parietal wall having a thin, 

 transparent callus. Alt. 50, diam. 25 mill. 



Mindoro, Philippines. 



ulimusvirgatusjA\,Cita\. 1839, p. 120, t. 6, f. 4. REEVE, 

 Conch. Icon., t. 9, f. 46. PFR., Monogr. ii, p. 40. SOWB., Conch- 

 Illustr., f. 112-114. Cochlostyla virgata and C. porracea HIDALGO, 

 Journ. de Conchyl. 1887, p. 181. Bui. sylvanus BROD., P. Z. S., 

 1840, p. 95. Partula labrella GRAT., Actes Soc. Linn. Brod., xi, p. 

 423, t. 4, f. Q.B.porraceus JAY, Catal., p. 120, t. 6, f. 5. Cochlo- 

 styla sylvanoides SEMPER, Reisen im Archip. Phil. Landmoll., p. 

 222, t.'lO, f. 4. 



The principal characters distinguishing this species from C. dryas, 

 are the longer aperture, the thinner parieto-columellar callus, the 

 more convex whorls and slenderer spire, and finally the darker 

 ground-color, which is always yellow. 



The following col or- varieties are connected by intermediate forms. 



The typical coloring (shown in fig. 35 of plate 17) is as fol- 

 lows : Ground color light yellow ; two broad brown zones upon the 

 body whorl continuing upon the reverse of the lip ; apical whorls 

 white; hydrophanous stripes present but sometimes evanescent; lip 

 not black-edged. 



Color variety porracea (pi. 17, fig. 36) is of a clear yellow or yel- 

 low-green color, with or without stripes of opaque hydrophanous 

 cuticle on the earlier whorls ; lip entirely pure white, its reverse 

 clear yellow ; apical whorls white. 



Color variety sylvanoides Semper (pi. 17 fig. 37 ; pi. 16, fig. 11) is 

 clear yellow or with white sutural and peripheral bands. The 

 earlier whorls are white ; the peristome is edged with black-brown, 



