PLACOSTYLUS, NEW CALEDONIA. 37 



and light yellow peristome. It is a variable species, and the number 

 of varieties could easily be extended, but without advantage to 

 science, so far as I can see. 



Tlfe prominent feature of the species is its extreme compression, 

 shown in fig. 2 of pi. 13. The last whorl ascends a little anteriorly ; 

 the columellar fold proper is not large, but there is a callus of 

 greater or less extent superposed upon it. The parietal tooth varies 

 a good deal in degree of development, fig. 1 representing one extreme, 

 fig. 8 the other. I suspect the latter is not adult. 



P. CORPULENTDS (Gassies). PL 9, fig. 27. 



Shell imperforate, large, somewhat ponderous, rather thick, globose, 

 a little compressed, ovate pyramidal, longitudinally rugose-striate, 

 chalky (being fossil and destitute of epidermis) ; suture impressed, the 

 apex acute. Whorls 6-7, convex, the last two-thirds the total length, 

 slightly compressed. 



Aperture long-ovate, contracted, auriculate, angular above, where 

 the outer lip is strongly sinuous, reflexed at the base. Columella 

 thick, a trifle concave, folded, the fold of moderate size, ascending 

 and entering. Parietal wall with a thick callus bearing a conic 

 tooth. Peristome thick, reflexed, the right margin deeply sinuate 

 above, prominently calloused in the middle. Alt. 100, greater diam. 

 55, lesser 50 mill. ; length of aperture 52 mill. (Gass.) 



Fossil ; Isle of Pines and islet of Koutonmo, in company with P. 

 senilis but scarcer (type locality Lambert); superficial strata at 

 Artillery Point, near Noumea (Layard). 



Bulimus corpulentus GASSIES, Faune N. Calecl. ii, p. 183 (1871). 

 Placostylus corpulentus KOBELT, t. c., p. 121, pi. 30, f. 1. 



The figure is copied from Kobelt, whose specimen came from 

 Artillery Point, near Noumea. It is more inflated than P. senilis or 

 P. goroensis, less so than P. alexander. 



P. ABBREVIATUS (Gassies). PI. 20, fig. 45. 



Imperforate, ponderous, thick, globose-rotund, conic-pyramidal, 

 longitudinally striate. Whorls 6^, the last globose. Aperture auri- 

 culate, contracted, round-ovate, angular above, the outer lip strongly 

 sinuated ; columella thick, slightly concave, with a moderate sized 

 ascending fold ; parietal callus thick, bearing a large conic tooth. 

 Length 68, diam. 37 mill. 



Fossil ; Lifu, Loyalty Is. (Lambert). 



