HELIX-OBBA. 239 



Numerous color-varieties have been figured, the more notable of 

 which are given on my plates. 



H. CERES Pfeiffer. PI. 53, fig. 99. 



Shell umbilicated, semiglobose-subcanipanuliform ; solid, lightly 

 striatulate, little shining, dull buff, ornamented with several reddish 

 bands ; spire convex, apex subtle, obtuse ; suture scarcely impressed. 

 Whorls 6i, scarcely convex, slowly increasing, the last not descend- 

 ing ; periphery carinated ; base more convex. Aperture diagonal, 

 obliquely lunar, whitish-flesh-colored inside ; peristome brownish- 

 flesh-colored ; margins remote, right margin expanded, basal shortly 

 reflexed, columellar margin dilated, having an oblique fold within, 

 vaulted outwardly, half-covering the narrow umbilicus. Alt. 14, 

 greater diam 23, lesser 20 mill. (P/K) 



Philippine Is. 



H. ceres PFR. P. Z. S. 1853, p. 49 ; Monographia, iii, p. 647. 

 KEEVE, Conch. Icon. f. 1021. 



Group of H. platyodon. 



Subglobose species, imperforate or narrowly umbilicated, with no 

 tendency to carination. Banded or unicolored. Lip reflexed ; 

 columella toothed more or less distinctly. 



H. PLATYODON Pfeiffer. PI. 32, figs. 35, 36, 37, 38, 39. 



Shell globose-depressed, imperforate, solid; white, with 5 rich 

 chestnut bands, the upper three much interrupted by white spots 

 and streaks, often fused into oblique, zigzag streaks, giving the 

 upper surface a brown-and-white maculated pattern. Surface 

 nearly smooth, delicately obliquely striate and densely microscop- 

 ically granulated all over. 



Spire moderately depressed, of 5s slightly convex whorls, the 

 first 2 glossy, corneous ; the last whorl deflexed in front. One of 

 the bands is below the suture, one at periphery, another midway 

 between them ; these three bands are usually broken into rhombic 

 blotches, which often coalesce with the blotches aJbove and below, 

 forming oblique streaks. The fourth baud is on the base, and is 

 less interrupted. Another band encircles the place of the umbili- 

 cus. Aperture quite oblique ; lip reflexed, white ; columellar mar- 

 gin bearing within a squarish or simply convex tooth-like process ; 

 at the insertion dilated over the umbilicus. 



Alt. 18, greater diam. 27, lesser 23 mill. 



Island of Hainan, S. China. 



