109 



Syn. Zoological Proceedings, Feb. 1832. 

 Shell nearly orbicular, rather depressed, whitish, with 

 an olive brown epidermis, which appears to be very deci- 

 duous and which is much thinner on the lower than on 

 the upper parts of the shell, where its remains form a broad, 

 dark band just below the suture ; spire somewhat raised, 

 reddish, obtuse, consisting of five or six rounded, spirally 

 grooved volutions; suture rather decurrent, and indistinct; 

 aperture nearly circular, oblique, white, rather acuminated at 

 the posterior part, and with a slightly thickened simple 

 pentreme; umbiHcus very large; operculum horny, thin, 

 hyaline, light brown, with numerous volutions and a 

 fringed m argin. Island of Tumaco, W. Col. Mr. Cuming. 

 55. C. FLAVUM. (pi. xxiv. f. 60.) Brod. Zool. Proc. 

 March 1832. 



T. subglobosa, crassiuscula, flava, spira brevi, subpyrami- 

 dali, anfractibus 5, ventricosis, spiraliter sulcatis, sutura 

 distincta ; apertura subcirculari, superne acuminata, peritre- 

 mate interne incrassato, margine labii extern! acuto ; umbilico 

 mediocri; operculo corneo, tenui. 



Shell nearly globose, thickish, yellow; with a short, 

 somewhat pyramidal spire, volutions five, ventricose, spirally 

 grooved, with a distinct suture; aperture nearly circular, 

 acuminated at the upper or posterior end, peritreme 

 thickened internally and the margin of the outer lip sharp- 

 edged : umbilicus of middUng dimensions ; operculum horny, 

 thin. 



Found by Mr. Cuming, buried in the earth, under the root of 

 a palm tree on Chain Island, S.S. This species has the aspect 

 of a marine shell and bears a close resemblance to Littorina. 

 56. C. ixcoNSPicuuM. (pi. xxiv. f. 73, 74.) nob. 

 T. suborbiculari, depressiuscula, albicante, Icevi, subrugu- 

 losa, spira depressa, obtusa, anfractibus quatuor subventri- 

 cosis, subdeclivibus, sutura distincta ; apertura suborbiculari, 

 superne acuminata, peritremate tenui, acuto ; umbilico magno. 

 Shell nearly orbicular, rather depressed, whitish, smooth 

 with slight rugulosities, spire depressed, obtuse ; four rather 

 ventricose, somewhat inclined volutions, with a distinct 

 suture ; aperture nearly orbicular, acuminated at the upper 

 part, with a thin, sharp-edged peritreme, which is close 

 pressed to the last volution just above the large umbilicus. 



