18 



COCHLOSTYLA-HYPSELOSTYLA. 



C. CINCINNIFORMIS Sowerby. PI. 6, figs. 21, 22, 24. 



Imperforate, ovate-pyramidal, rather thin ; white or very pale 

 buff, having dark brown bands above and below the sutures, at the 

 periphery and around the colurnella ; the subsutural and frequently 

 the peripheral band tessellated with hydrophanous yellow spots. 



The spire is elevated, but rather wide. Apex obtuse, purple or 

 white; whorls 5J, slightly convex, the last angulated more or less 

 distinctly at the periphery. Aperture oblique, showing the bands 

 distinctly inside. Peristome thin, distinctly but very narrowly 

 expanded, white, stained with purple at the terminations of the 

 bands. Columella straight above, somewhat truncate below. 



Alt. 48, diam. 27 ; aperture, alt. 20 mill, 

 aperture, alt. 18 mill, 

 aperture, alt. 19J mill. 



Luban, Philippines. 



Helix cincinniformis SOWB., P. Z. S., 1841, p. 17. Bulimus tin. 

 PFR., Monogr. ii, p. 9 ; Conchyl. Cab. p. 181, t. 53, f. 6, 7. REEVE, 

 Conch. Icon. t. 6, f. 28. DESK, in Fer. Hist. t. 157, f. 3, 4. 



This species is closely allied to C. cincinna and C. subcarinata. 

 It differs constantly from the variety romblonensis of the former 

 species in being a less elongated shell, thinner in texture, and with 

 thin, narrowly expanded lip, and in having the upper part of the 

 spire decidedly stouter. Figure 23 of pi. 6 represents a specimen 

 of cincinnus var. romblonensis. 



The differences are made clearer in the following comparison : 



Alt. 36, diam. 24 

 Alt. 34, diam. 25 



C. cincinna var. romblonensis. 



Shell slender, with narrow, 

 straight-sided spire. ^^ 



Dark bands not spotted. 



Shell solid. 



Lip dark, obtuse. 



Semper has considered this 

 although it is certainly closely 

 specimens before uniting them, 

 flecks upon the bands in fig. 22. 



C. cincinniformis. 



Shell stouter, the outlines of 

 spire convex above. 



Dark bands spotted with light 

 spots. 



Shell thin. 



Lip white, except at the ter- 

 minations of the bands, thin, 

 narrowly expanded. 



species a form of cincinna, but 

 allied I prefer to see intermediate 

 My artist has omitted the light 



