114 



68. C. DISTOMELLA. (pi. XXV. f. 94.) HOb. 



T. suborbiculari, depressiuscula, laevi, albicante, fascia 

 fusca infra mediam anfractus ultimi ; spira subprominula, 

 nigricante, anfractibus 5, rotundatis, laevigatis, sutura pro- 

 funda impressa ; apertura circulari, peritremate duplici, in- 

 terne simplici, continue, externo tenui, extus sub-variciformi, 

 supeme seu postice intemipto. 



This is a very remarkable species of a nearly orbicu- 

 lar, rather depressed shape, smooth, whitish or dull brown 

 with a dark brown band below the centre of the last 

 volution : spire rather prominent, blackish, consisting of five 

 rounded smooth volutions, with a distinct, deeply impressed 

 suture ; aperture circular, with a double peritreme, the inner 

 of which is simple and continuous, and the outer thin, some- 

 what inflated and variciform externally ; and interrupted at 

 the upper or posterior part close to the last volution. 



69. C. CARiNiFERUM. (pi. XXV. f. 98.) nob. 



T. orbiculari, subdepressa, fulvescente-fusca, cingulo 

 saturatiori; anfractibus 5 rotundatis, spiraliter striatis et 

 cariniferis, carinis 8 — 10 acutis, superioribus majoribus ; 

 apertura magna, orbiculari, peritremate reflexo, postice supra 

 anfractum ultimum paululum extenso ; umbilico maximo, 

 spiraliter striate ; sutura distincta. 



Shell orbicular, depressed, yellowish brown with a 

 belt of a darker colour ; volutions five, rounded, with 

 numerous spiral strife and from eight to ten sharp keels, of 

 which the upper are the larger ; aperture large, orbicular, 

 with a reflected peritreme, which is slightly extended over the 

 last volution at the upper or posterior part ; of a dark brown 

 colour within : umbilicus very large, spirally striated within ; 

 suture distinct. 



70. C. LuzoNicuM. (pi. xxvii. f. 136. 137-) nob. Zool. 

 Proc. June, 1842. 



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

 obtusa ; anfractibus 4 — 5, rotundatis, concinne spiraliter 

 striatis, fascia albida infra-suturali fusco-articulata ; sutura 

 profunda; apertura circulari; peritremate crasso, reflexo; 

 umbilico maximo. 



Shell nearly orbicular, whitish, varied with brown, spire 

 somewhat depressed, obtuse ; volutions from 4 to 5, rounded, 

 with close set spiral striae, and a whitish band articulated with 

 brown immediately below the suture, which is strongly 

 marked and deeply placed ; aperture circular ; peritreme 



