112 



striated volutions, rather flattened towards the indistinct 

 suture, nearly free from grooves in front ; aperture circular, 

 obliquely placed, slightly angular posteriorly, peritreme 

 slightly reflected, slanted off toward the umbilicus, which is 

 very large and smooth within. From Yemen, Arabia ; com- 

 municated by Mr. Powis. 



62. C. vittatum, (pi. xxv, f. 89. 90.) nob. 



T. subdiscoidea, spira elevatiuscula ; anfractibus quinque, ro- 

 tundatis, albicantibus, spiraliter fusco-fasciatis, superne spira- 

 liter striatis ; sutura distincta ; apertura magna, circulari, 

 intus fulva,fusco-fasciata, peritremate albicante, reflexo; um- 

 bilico amplo, anfractibus intus conspicuis. 



Shell subdiscoid, with a rather elevated spire ; volutions 

 five, rounded, whitish, spirally banded with brown, and 

 longitudinally striated on the upper part ; suture distinct ; 

 aperture circular, yellowish, with brown bands within, peri- 

 treme whitish, reflected ; umbilicus large, the volutions con- 

 spicuous within. Brought from Madegascar by Mr. Caldwell. 



63. C. exiguum. (pi. xxv. f. 92.) nob. 



T. subdiscoidea, spira elevatiuscula ; anfractibus quatuor, 

 rotundatis, albis, lajvibus ; sutura profunda impressa ; aper- 

 tura circulari, peritremate marginato ; umbilico magno. 



Shell subdiscoid, with a rather elevated spire, and with four 

 rounded white smooth volutions ; suture deeply impressed ; 

 aperture circular, with a reflected bordered peritreme : umbi- 

 licus large. 



64. C. Mexicanum. (pi. xxv. f. 93.) Menke. 



T. orbiculato-convexa, albida, opaca, spira submucro- 

 nata, anfractibus 5, rotundatis, transversim striatis ; sutura 

 profundiuscula : apertura circulari, intus flavida : peritremate 

 obtuso, reflexo, latere anfractus ultimi emarginatione obtusa ; 

 umbilico lato et profundo. 



Shell orbiculato-convex, whitish, dull, with a slightly 

 mucronated spire consisting of five volutions, which are 

 rounded and transversely striated and separated by a rather 

 deep suture : aperture circular, yellowish within : peritreme 

 obtuse, reflected, with an obtuse notch in the side next to the 

 last volution : umbilicus broad and deep. 



Found near Papontla in Mexico, Schiede. 



65. C. maculosum. (pi. xxxi. f. 256, 257.) nob. 



T. suborbiculari, depressa, crassiuscula, leevi, castanea, 

 albido-maculosa ; spira paululum levata, apice nigricante ; 

 anfractibus 4, rotundatis, obsolete spiraliter striatis ; aper- 



