48 PLACOSTYLUS, NEW CALEDONIA. 



de Conchyl., xxi, p. 51, pi. 2, f. 6, 1873 ; Cf. Faune Conch. Nouv.- 

 Cal6d., iii, p. 47, 1880 (as monstr. of B. ouveanus). PFR., Monogr., 

 viii, p. 121 Placostylus tzsopeus KOBELT, t. c., p. 82, pi. 19, f. 7 

 (??), 8, 1891. P. ouveanus var. asopea CROSSE, t. c., p. 261. 



P. ouveanus is smaller, thinner and rougher than P. Jibratus, but 

 Crosse is probably right in considering it a form of that species 

 dwarfed by the lack of lime, and produced with substantially the 

 same appearance, independently, in several distinct localities. Some 

 specimens are orange within the aperture. 



Var. lifouanus Crosse. Smaller, hardly thickened, dirty white, 

 not shining, under a brown, almost wholly deciduous cuticle. Length 

 46, diam. 26 mill. (Crosse). 



Lifu, Loyalty Is. (Marie). 



Var. albus Crosse (pi. 27, fig. 25). White, destitute of epidermis, 

 the aperture and peristome uniform milk-white ; columellar fold 

 tooth-like ; parietal fold small, scarcely noticeable. Length 48, diam. 

 23J, aperture 24 mill. 



Siande, New Caledonia (Marie). 



Form sinistrorsus Crosse. A sinistral form from Lifu. 



Monst. scalaris Crosse. Turreted, with abnormally deep sutures, 

 long spire and rounded whorls. From Lifu. 



Monstr. asopeus Gassies (pi. 20, fig. 43) is an abnormally depressed 

 form, described from the Isle of Pines. It is probably not correctly 

 referred to ouveanus, but belongs rather to Jlbratus. It is a " sub- 

 fossil " shell, not yet found living, and apparently a mere individual 

 monster. 



P. SOUVILLEI (Morelet). PI. 22, fig. 4. 



Shell imperforate, very large and capacious, ovate, solid ; dark 

 yellowish-chestnut, with numerous darker reddish-chestnut belts and 

 lines. Surface sculptured with moderate growth-wrinkles, but with- 

 out spiral sculpture ; sometimes somewhat malleated in places. Spire 

 conic, the apex slightly obtuse. Whorls 6J, but slightly convex, the 

 last large and oval, hardly compressed between the front and back. 



Aperture vertical, ample, deep red-orange within the lip, fading in 

 the throat to pale ochre or blue-white; peristome obtuse but not much 

 thickened, the outer lip whitish, a little sinuous ; columella bearing a 

 large callous fold above ; parietal wall with a rather low blunt tooth, 

 and with the columella, of a red orange color. 



