122 



circular, its upper part slightly canaliferous ; peritreme 

 white, thickened, reflected ; umbilicus middle-sized, its mar- 

 gin obtusely keeled, smooth within ; operculum horny, thin, 

 spiral. Lamarck has confounded several species under the 

 name of C. Volvulus, but this appears to be the one to which 

 that name was first applied. Chemnitz has given two species 

 under the name of Turbo Volvulus, but the present appears 

 to be the only one to which no other name has been given. 

 Found at Pulo-Condore according to M. S. in the Banksian 

 Collection. 



90. C. PERDix. (pi. xxvii, f. 127. 128.) nob. Zool. 

 Journ. iv. 



T. suborbiculari, albida, fusco-varia, spira subdepresso- 

 conica, subacuminata ; anfractibus 4 — 5, primis carinatis, ul- 

 timo carina obsoleta, fascia suturali pallida, fusco-articulata ; 

 sutura subobsoleta ; apertura circular! ; peritremate expanso, 

 subrevoluto ; umbilico magno. 



Shell nearly orbicular, whitish, varied Avith fuscous ; spire 

 rather depressed conical, rather acuminated with from 4 — 5 

 volutions, the first of which are keeled, and the last with the 

 keel obsolete, and a pale band, articulated with fuscous im- 

 mediatelely below the suture, which is rather indistinct ; 

 aperture circular ; peritreme spreading, almost revolute ; um- 

 bilicus large. A variety occurs with more ventricose and less 

 strongly keeled volutions, a more elevated spire, and a white, 

 thickened, revolute peritreme. Another variety has ventricose 

 volutions, and an orange coloured peritreme. The young 

 shells have an angular aperture, 



91. C. TUBA. (pi. xxvii. f. 129. 130.) vide Zool. Proc : 

 June, 1842, p. 83. 



T. suborbiculari, depressiuscula ; tenui, Isevi, albicante, 

 rufescente-fusco variegata et nubeculata ; spira brevi, subde- 

 pressa, acuminata; anfractibus quinis, planiusculis, primis 

 carinatis, ultimo maximo, rotundato ; apertura maxima, circu- 

 lari, expansa, albicante, peritremate albicante, tenui, lato, revo- 

 luto, supra anfractum ultimum interrupto ; umbilico magno. 



Shell suborbicular, rather depressed, thin, smooth, whitish, 

 varied and clouded with reddish brown ; spire short, rather 

 flattened, acuminated at the apex ; volutions 5, flattish, the 

 posterior carinated, the last very large, and rounded ; aperture 

 very large, circvdar, expanded, whitish : peritreme whitish, 

 thin, broad, revolute, interrupted over the last volution : um- 

 bilicus large. 



