PLACOSTYLUS, NEW CALEDONIA. 67 



In many specimens of P. scarabus the parietal callus has a low 

 longitudinal ridge, inside of which the color abruptly changes. 

 Var. goulvainensis Kobelt. PI. 33, fig. 7. 



Rudely and irregularly costate-striate, malleated ; rose-white cov- 

 ered with a yellowish-brown epidermis streaked with darker. Last 

 whorl compressed, distinctly angulated on the left side, ascending in 

 front. Aperture bright orange-brown inside, peristome scarcely 

 expanded, thickened, white ; parietal callus reddish changing to 

 brownish within. Columellar margin dilated, bearing a prominent, 

 compressed, hardly entering fold. 



Alt. 64, diam. 38, alt. apert. 39 mill. 



Near Gape Goulvain, west coast of New Caledonia (Saxton). 



Placostylus goulvainensis KOBELT, t. c., p. 109, pi. 26, f. 5, 6 

 (1891). P. smithii var. goulvainensis CROSSC, J. de C., 1894, p. 287. 



Section Lcucocharis Pilsbry, 1900. 



Slender, thin, arboreal forms, white or but slightly guttate, only 

 lir apical whorls pitted. 



These forms have no close relationship with Charis and Aspastus, 

 with which Crosse associates them. They are peculiar in the reduc- 

 tion of the nepionic pitted shell to 1^ whorls. They seem to have 

 no closer affinity with species of other island groups than the common 

 bond uniting all the Placostyles ; the slender contour, light texture 

 and pale color being purely adaptive characters, assumed with arbor- 

 eal habits and independently, by various species of Placostylus and 

 of other groups of land snails. 



P. PANCHERI (Crosse). PL 33, figs. 1-4. 



Shell compressed-umbilicate, oblong-fusiform, thin, gr ay- white ; 

 surface shining, sculptured with slight growth -striae and on the last 

 whorl, close, irregular, frequently anastomosing or interrupted, spiral, 

 white wrinkles. Spire rather slender, the apex rather obtuse ; early 

 whorls hardly punctate. Whorls 4^, quite convex, the last more in- 

 flated ; suture often narrowly margined. 



Aperture oval, gray-white inside ; peristome thin, narrowly re- 

 flexed, white ; columella dilated above, typically orange-brown; the 

 fold not visible from in front, being slender and deep-seated. 



Alt. 36, diam. 16J, length of aperture 21 mill. 



New Caledonia : Boulari, in the mountains (Pancher) ; environs 



