/& 



PLACOSTYLUS, NEW CALEDONIA. 65 



Var. saxtoni " Layard " Kobelt. PI. 33, figs. 8, 9. 



Very narrowly rimate, solid and ponderous, compressed from front, 

 to back, siroothish, irregularly wrinkled with growth-lines, and 

 slightly malleated circularly ; covered with a chestnut cuticle streaked 

 with darker and yellowish, the spire and a subsutural band denuded. 

 Whorls 6-jr or 7, the last gibbous on the left side. Aperture con- 

 tracted, orange-red within ; peristome whitish, shading to a peculiar 

 golden-orange color toward the inner edge of lip, columella and pari- 

 etal wall. Outer lip very much thickened, having a deep rounded 

 sinus above, below which the outer lip bears a heavy, inflexed 

 callus ; columella straight in the middle, with a tubercle at each 

 end. Parietal wall toothless. 



Alt. 75, diam. 40 mill. 



Alt. 70, diam. 41 mill. 



Alt. 58, diam. 34^ mill. 



Coumac, west coast of New Caledonia (Layard). 



Placostylus saxtoni Layard, KOBELT, Conchyl. Cab., p. 97, pi. 

 23, f. 5, 6 (1891) CROSSE, J. de C., 1894, p. 283. 



The decidedly different tint of the inner edge of the peristome, and 

 the stronger callus of the outer lip, distinguish this variety from P. 

 pseudocaledonicus. 



P. SCARABUS (Albers). PI. 31, figs. 16, 17 ; pi. 27, fig. 28. 



Imperforate or rimate, ovate, solid and ponderous ; light brown, 

 with many conspicuous encircling chestnut lines and bands, the spire 

 denuded. Surface sculptured with low growth-wrinkles. Whorls 

 6^, the last rather obese, ascending in front. 



Aperture oblong, dark purplish within, usually becoming red- 

 orange in the throat; peristome thick and obtuse, white; the outer 

 lip more or less sinused above, thickened below the sinus ; columella 

 oblique or vertical, generally bearing a short fold close to the upper 

 insertion, and separated from it by a groove ; the base more or less 

 distinctly truncated. Parietal wall covered with a strong white 

 callus, which becomes abruptly thin within, and bears the small rudi- 

 ment of a median tooth. 



Alt. 57, diam. 33 mill. Alt. 60, diam. 32 mill. 



Art Island (Montrouzier); Belep Is. (Marie); Arama, to the N. of 

 Balade ; Poume peninsula (Gassies); Baaba /., west coast of New 

 Caledonia (Debeaux). 

 5 



