from the Province of Tavoy. 459 



brown, clouded by yellowish spots of various sizes, which, 

 on the posterior whorls, are arranged in radiating zigzag 

 series ; a broad space around the umbilicus, which is very 

 large and deep, is light straw color, with occasional revolving 

 black lines or bands ; aperture ample, somewhat wider than 

 high, bluish within ; peristome moderately reflected, rounded, 

 of a beautiful carmine, or bright cherry-red color ; not con- 

 tinuous, but embracing less than one fourth the preceding 

 whorl, across which space passes a callus of the same red color. 



Diameter 2 inches ; height 1 inch. 



This superb species is a little larger than any one hitherto 

 described. The C. involvidus, Sowb., is a miniature of it. I 

 received six specimens, young and old, all of the same mag- 

 nitude. 1 received with them a multitude belonging to other 

 smaller species ; but they w^ere so variable in appearance, that 

 I do not yet venture to pronounce them new species. 



CrCLOSTOMA SECTILABRUM. 



Plate XXIV. Fig. 10. 



Testa turrita, spira acuminata, arete umbilicata, hrunnea; anfr. 8 sub-ventricosis^ 

 vix striatis, penultimo sub-gibbo ; apertura sub-orbiculari, intus rubescente, peri- 

 tremate duplici. incrassato, albo, prope angulum posticum canali paurvo inierrupta. 



Description. 



Shell elongated, spire acutely terminated, of a light reddish- 

 brown color ; whorls about eight, convex, nearly smooth, and 

 shining ; the penultimate whorl, on a profile view, somewhat 

 gibbous ; last whorl not conforming to the axis of the pre- 

 ceding whorls, but thrust forward, so that the plane of the 

 aperture advances beyond a parallel with the axis; aperture 

 colored as without ; lip white, everted moderately, having a 

 slight fissure or canal across it posteriorly, at the outer angle 

 of the aperture ; posteriorly the lip is double, the iimer por- 

 tion continuous, the outer terminating as it touches the shell ; 

 umbilicus small ; operculum thin, horny. 



Length 1 inch ; breadth ] of an inch. 



Closely resembles C. ahum, Sowb., but has the fissure 

 across the peritreme on the opposite side. C. croceum, Sowb., 

 may be only a faded specimen of this shell. 



