36 PLACOSTYLUS, NEW CALEDONIA. 



ii, p. 74 (1871) MARIE, J. de C. xviii, p. 382 (1870) var. crassa 



PFR., Monogr. viii, 18. 



Var. LEUCOSTOMA : B. alexander, var. e, CROSSE J. de C., xxii, 

 p. 108, 182 (1874); xxiii, p. 139, pi. 6, f. 4, (1875). Placostylus 

 alexander, var. leucostoma, KOBELT, Conch. Gab., Placostylus, p. 29, 

 (1891). 



Var. NIGRICANS : Bulimus souvillei var. B nigricans, CROSSE, J. 

 de C. ii, p. Ill, (1864). 



Var. procerula Crosse, 1864 (pi. 14, fig. 8). More lengthened, 

 the aperture paler ; callosities of the inner lip almost wanting ; lip 

 reflexed but less thickened. Length 90, diam. 55 mill. 



Var. ouagapensis Crosse, 1869. A little smaller and shorter, 

 hardly shining, whitish-roseate under a pale chestnut cuticle, which 

 is very deciduous especially on the earlier whorls. Aperture vivid 

 orange inside, becoming buff-whitish in the throat ; peristome pale 

 orange, the margins strongly thickened, the basal one somewhat pro- 

 jecting, showing an obtuse tubercle. Length 78, diam. 48, aperture 

 with peristome 49 mill, long, 30 wide (Crosse). Wagap. 



Var. crassa Crosse, 1870 (pi. 14, fig. 7). Larger, wider; dirty 

 white under a blackish chestnut cuticle which is obscurely marked 

 with minute, almost inconspicuous, transverse narrow bands. Last 

 whorl much longer than the spire (as 66 to 34), ascending, broadly 

 ventricose, the sides compressed, angular. Aperture orange ; peri- 

 stome buff-orange, thickened, the margins joined by a thick callus 

 bearing an obtuse tubercle ; columellar margin broadly expanded, 

 lightly twist-folded. Length 119, diam. 66, aperture with peristome 

 65 mill, long, 42 wide (Crosse). Wagap (Ouagap). 



Var. leucostoma Crosse. (PI. 14, fig. 6). A little smaller than the 

 typical form ; whorls 6, the first 4 whitish, nude, the penultimate 

 and last covered with a chestnut cuticle, obscurely and slightly flex- 

 uously transversely lineolate. Aperture milk-white inside ; peristome 

 milk-white, at the edge ivory-yellowish. Length 75, diam. 47 mill. ; 

 aperture with peristome 54 mill, long, 34 wide (Crosse). 



Var. nigricans Crosse. Blackish, with somewhat undulating nar- 

 row bands. A form of large size and with nearly black epidermis, 

 formerly referred to P. souvillei. It has the lateral angulation of 

 P. alexander, however. 



The typical form of P. alexander is short, with whitish aperture, 



