208 HELIX-CAM^ENA. 



by the terminating white bands ; baso-columellar margin reflexed, 

 expanded over and almost covering the umbilicus. 



Alt. 43, diam. 46 mill. 



Alt. 46, diam. 50 mill. 



Alt. 38, diam. 55 mill. 



Island of Palawan, Philippines ; N. E. Borneo, on Palawan Pas- 

 sage. 



H. trailli PFR. P. Z. S. 1855, p. 107, t. 32, f. 4 ; Mon. Hel. Viv. 

 iv, p. 256. DOHRN, Conchyl. Cab. p. 576, t. 170, f. 1, 3. ISSEL, 

 Moll. Borneensi, in Ann. Mus. Civ. Genova, vi, p. 409, 1874. 



A fine large species, easily known by its sculpture, form and pecul- 

 iar color-pattern. It has been referred by various authors to Heli- 

 costyla, Acavus and Phcenicobius, but it doubtless belongs in this 

 place. 



H. MONOCHROA Sowerby. PI. 22, figs. 58, 59, 60, 61, 62. 



Shell half-covered umbilicate, globose-depressed, solid, opaque, 

 yellowish-russet, with a narrow chestnut margin below the suture, a 

 narrow band of the same shade at the periphery, and a wider one 

 below. Surface obsoletely obliquely striate and slightly malleated 

 or rugose, nearly lusterless. Spire low ; sutures impressed. Whorls 

 4-r, somewhat convex, the last rounded at the periphery, slightly de- 

 scending in front. Aperture quite oblique, white inside ; peristome 

 expanded and reflexed all around, and either edged with dark, or 

 entirely of a deep chocolate shade. Umbilicus rather large inside, 

 but more than half covered by the expanded columellar lip. 



Alt. 34, diam. 45 mill. 



Alt. 30, diam. 50 mill. 



Palawan, Philippines, and North-east Borneo. 



H. monochroa Sow. Proc. Zool. Soc. Lond. 1841, p. 1. PFR. 

 Symb. ii, p. 34 ; Monogr. Hel. Viv. i, p. 330 ; Conchyl. Cab., p. 326, 

 t. 57, f. 1-3. REEVE, Conch. Icon., f. 11. DOHRN, Nachrbl. D. M. 

 Ges. 1889, p. \.H.palawanica PFR. P. Z. S. 1855, p. 107, t, 32, 

 f. 7 ; Monogr. iv, p. 261. DOHRN, Conchyl. Cab., p. 577, t. 170, f. 

 2, 4, and t. 171, f. 1-3. ISSEL, Annali Mus. Civ. Genova, vi, p. 409. 

 -HIDALGO, Journ. de Conchyl. 1887, p. 108, t. 5, f. 1. H. saulcs 

 PFR. P. Z. S. 1845, p. 72 ; Monogr. Hel. Viv. i, p. 331. REEVE, 

 Conch. Icon., f. 393. H. lagunce HIDALGO, Journ. de Conchyl. 1877, 

 p. 108, t. 4, f. 5. H. dorice DOHRN, Nachrichtsbl. D. M. Ges., May 

 1881, p. 67. 



