CAM.ENA. 267 



iii are usually separated by a distinct light peripheral zone, and band 

 iv is generally bounded by a basal light zone. Band ii is generally 

 narrow and dark, immediately above the periphery, but it is some- 

 times widened, and in C. trailli it is split into two. Most species of 

 the Philippine Island group of Camcena (\uc\\\diugPhcenicobi\is and 

 Pseudobba) possess all four bands ; but in some, such as C. mamilla, 

 the umbilical patch is wanting. In the Indo-Chinese group of 

 species, bands i and iv are wanting ; band ii only being retained in 

 hxinanensis, illustris, xanthoderma, etc., and band iii in cicatricosa, 

 pachychila, etc. Besides these, numerous narrow lines are developed 

 in some species. 



The general system of banding in Hadra is similar to that of 

 Camcena. See Manual, vol. VI, p. 129, 149. 



C. ARATA Sowerby. PI. 18, figs. 2, 3, 4, 5. 



Shell pupiform, elevated, narrowly umbilicated, solid, rich chest- 

 nut-brown, becoming lighter or yellowish on the spire, but retaining 

 a brown band above the suture ; the body-whorl generally showing 

 a light peripheral girdle, with sometimes another around the 

 umbilicus. Surface sculptured with strong unequal and irregularly 

 spaced oblique riblets. 



Spire convex-conic; whorls 6*, the last descending in front. 

 Aperture oblique, truncate-rounded, pinkish-white within ; peristome 

 widely expanded, dark chestnut colored. Columella with a white 

 tract at its insertion. 



Alt. 44, diam. 28 mill. 



Alt. 30, diam. 24 mill. 



Tablets, Philippine Is. 



Helix (Helicostyla f) arata SOWB., P. Z. S. 1840, p. 89. REEVE, 

 Conch. Icon., t. 15, f. 59. Bulimus aratus PFR., Conchyl. Cab. Bui. 

 p. 204, t. 57, f. 10 ; Monogr. ii, p. 77. Papa (Phcenicobius) arata 

 MORCH, Catal. Yoldi, p. 33. 



Differs from the closely allied C. brachyodon in the strongly 

 developed folds of the surface. 



Color-var. lutea (pi. 18, fig. 5). Shell unicolored light buff; entire 

 lip pure white. 



C. BRACHYODON Sowerby. PI. 18, fig. 1. 



Shell globose-turbinate, narrowly umbilicated, solid, dark reddish- 

 chestnut, fading to brown on the spire, and having a narrow light 

 peripheral girdle and a wider yellow circum-umbilical band. Sur- 



