COCHLOSTYLA-CORASIA. 125 



H. samboanga H. & J. Voy. Pol Sud v, p. 15, t. 5, f. 18-20. 

 PFR. Mon. Hel. Yiv. iv, p. 215. Cochlostyla zamboangce v. MART., 

 Ostas. Zool. ii, p. 89. H. (Ooratia) zamboangce, HIDALGO, Obras. 

 Malacol. p. 151, t. 22, f. 2, 3. Cochlostyla (Corasia) Magtanensis 

 SEMPER, Archip. Phil. Landmoll. iii, p. 170, t. 10, f. 11. v. MOLL. 

 Landschn. Fauna Cebu, p. 231, with var. nana and globosa. 



More depressed than C. intorta, and with less expanded peristome. 

 The following are considered varieties by Hidalgo. 



The C. magtanensis of Semper, (pi. 28, figs. 27, 28) is a small 

 form from the island of Magtan. It is not separable from the typi- 

 cal samboanga, being identical in coloring. 



Var. intaminata Gould, (pi. 27, fig. 1) is entirely white, very thin, 

 and visibly angulated at the periphery. It is from the island of 

 Mangsi, straits of Balabac. 



C. INTORTA Sowbery. PI. 28, figs. 16-24. 



Imperforate, globose-depressed, thin, rounded at the periphery ; 

 typically light straw-colored with peripheral, basal and sutural bands 

 of chestnut brown ; (see below). Surface smooth, having light 

 growth-lines, and on the earlier whorls spiral striae are visible under 

 a lens. Apex flattened, polished, white, brown, pink or purple. 

 Suture linear, margined by a white line. Whorls 4-4}, the last 

 very little descending. Aperture broad, rounded-lunar, oblique ; 

 entire lip narrowly expanded, varying from flesh-tinted to dark 

 brown. Columella oblique, nearly straight above, arcuate below, 

 somewhat flattened and excavated. 



Alt. 21, greater diam. 32 mill. 



Alt. 24, greater diam. 32 mill. 



Alt. 17, greater diam. 26 mill. 



Islands of Tablas, Panay, Guimaras, Negros, Zebu, Siquijor, 

 Bohol, Capul and Mindanao, Philippines. 



H. intorta SOWERBY, P. Z. S. 1840, p. 168. REEVE, Conch. Syst. 

 ii, 1. 164, f. 1 ; Conch. Icon., t. 20. PFR., Symbols ii, p. 31 ; Conchyl. 

 Cab., p. 311, t. 53, f. 8-11 ; Monogr. i, p. 262. DELESSERT, Rec., t. 

 38, f. 7. Cochlostyla (Corasia) intorta SEMPER, Reisen, p. 170. 

 v. MOLL. Landschn. Fauna Cebu, p. 231 (with varieties). H. 

 (Corasia} intorta HIDALGO, Obras Malacol i, p. 149, t. 22, f. 5-9. 



The form and elevation of the spire vary in this beautiful species, 

 as the measurements and figures show. Specimens having an obtuse 

 peripheral carina also occur. The principal color-forms are as 

 follows : 



