PLACOSTTLUS, NEW CALEDONIA. 45 



ing a strong whitish tubercle ; columellar margin strongly folded ; 

 outer margin slightly sinuated above. Length 111, diam. 47, aper- 

 ture with peristome 56 mill, long, 33 wide. (Gassies.) 



Yale, Conception, Bay de Sud, Mont Coqui (Marie), Goro (Lam- 

 bert). Widespread in the south, but not at Balade or Kanala. 



This form attains a length of 150 mill, at Goro. It is referred to 

 P. souvillei by Gassies. 



Var. CRASSUS " Layard " Kobelt (PI. 18, fig. 30). Imperforate, 

 ovate, solid, thick, rudely and subregularly costate-striate, indis- 

 tinctly spirally rugose or malleated, covered with a greenish-brown 

 epidermis ; spire shortly conic, the apex acute. Whorls 7, convex, 

 separated by an impressed, crenulated and white-bordered suture, the 

 last whorl large, compressed, ascending in front. Aperture large, 

 ovate, vivid purplish-orange within, the peristome paler or pale 

 orange, very glossy ; peristome thickened, a little reflexed, margins 

 joined by a thick glossy callus, which is toothless or with a very 

 slight tooth, the outer margin produced in the middle, columellar 

 margin dilated, appressed, armed with a paler tuberculiform fold. 

 Alt. 88, diam. 48, length of aperture with peristome 54 mill. (Ko- 

 belt.} Isle of Pines. 



Var. ventricosus Kobelt (pi. 17, fig. 25). Near var. crassus, but 

 the shell is thinner, wider, last whorl more compressed, nearly angu- 

 lated along the left side, the parietal callus bearing a tubercle. Alt. 

 90, diam. maj. 50, min. 36 mill. Isle of Pines. 



Var. ovalis Kobelt (pi. 18, fig. 33). Differs from the type in the 

 ovate, thinner shell with short spire, the last whorl exceeding two- 

 thirds the total length of the shell, compressed below. Aperture 

 large, nearly entire ; throat blood-orange colored, the peristome paler. 

 Alt. 85, diam. 43, aperture 54 mill. (Kob.). Isle of Pines. 



Var. ovata Crosse (pi. 16, fig. 20). Rather large and ventricose, 

 with open aperture and small columellar fold and parietal nodule. 

 Scarcely to be distinguished from the preceding variety, which is 

 prior. 



Var. EDWARDSIANUS Gassies, (pi. 19, figs. 39, 40). Umbilicated, 

 small, length about 60-65 mill., white under a decidedly deciduous 

 black streaked chestnut cuticle, compact, the spire rather short and 

 conic. Aperture small, contracted, red within, peristome ivory- 

 white, very much thickened, built forward, having a deep sinus above, 

 the columella with a moderate fold; parietal tooth whitish, deep- 

 seated. Nekete, Kanala, and Pot Island. 



