46 PLACOSTYLUS, NEW CALEDONIA. 



Var. strigatus \\. v. (pi. 15, fig. 19, and pi. 19, fig. 36, 37). This 

 form is similar to v. edwardsianus in size and contour, and in the more 

 or less deciduous chestnut and black streaked cuticle. It is usually 

 umbilicated or perforate, often spirally malleated. The aperture is 

 similar to that of edwardsiana but with far less developed peristome. 



Var. mareanus Crosse, 1870, (pi. 18, figs. 31,32). Small, thick, 

 rosy-whitish under a chestnut-brown, partly deciduous cuticle. 

 Whorls 7, the earlier 3^ roseate, the last whorl slightly ascending, 

 about as long as the spire. Aperture beautiful violet-purple inside, 

 parietal callus thick, bearing a tubercle ; columellar margin strongly 

 twisted-plicate, outer margin strongly sinuated above. Length 66, 

 diam. 28, length of aperture wtth peristome 33 mill. (Crosse). 



Mare and Ouvea, Loyalty Is. The figures represent P. ouveanus 

 var. turrita Kob., which Crosse holds to be identical. 



P. ARENOSUS (Gassies). PI. 20, fig. 44. 



Irnperforate, thick, malleated ; whorls 6, the apex rather obtuse ; 

 aperture contracted, auriculate, the peristome thick, slightly reflexed; 

 columell'i thick, plicate ; a descending dentiform parietal fold 

 above. Length 75, greater diam. 55, lesser diam. 30, aperture 28 

 mill, long, 10 wide. 



Fossil ; Lifu, Loyalty Is. (Lambert). 



Bulimus arenosus GASSIES, J. de C., 1878, p. 333 ; Faune iii, p. 

 40, pi. 3, f. 1. Plac. arenosus KOUELT, Conchyl. Cab., p. 123, pi. 

 30, f. 3. (Copied from Gassies.) 



Allied to some forms of P. jibrdtus, and perhaps referable to that 

 species as a variety. 



P. FALCICULA (Gassies). Unfigured. 



A fossil form from South Bay (Baie du Sud), New Caledonia. 

 Destitute of cuticle and color, long-oval, ovate, noticeably perforate, 

 strongly striate longitudinally, cut by transverse stria? and "imbri- 

 cated," the suture margined and ruffled. Whorls 7, slightly convex, 

 the last f the total length. Aperture ovate, very angular above and 

 rounded at the base, ends of the peristome connected by a thick cal- 

 lus bearing a median, conic tooth. Columella subvertical, without 

 external twist. Outer lip strongly notched above, sickle-shaped, the 

 lower termination of the notch forming an almost acute angle. Peri- 

 stome very convex, light yellow with nacreous reflections ; interior 



