718 MR. G. B. SOWERBY ON NEW SHELLS. [Nov. 4, 



9. Descriptions of twelve new Species of Shells. 

 By G. B. Sowerby, Jun. 



[Eeceived September 15, 1873.] 



(Plate LIX.) 



1. Cyclostoma balteatum, sp. nov. (Plate LIX. fig. 1.) 



C. testa globuso-conica, modice umbilicata, griseo-alba, ferru- 

 gineo tincta, purpureo-fusco spiraliter lineata et infra periphe- 

 riam unizonata ; anfractibus sabrotundatis, undique decus- 

 satim striatis, spiraliter superne et in/erne liratis ; apertura 

 circulari, intus fusco fasciata ; labro albicante, latere externo 

 vix expanso, latere ventrali tenuiter expanso ; operculo calcareo 

 spirali, planulato, anfractibus tribus. 

 Hab. Madagascar. 



A globosely conical shell, moderately umbilicated, greyish white, 

 tinged with rust-brown, spirally banded with purplish-brown lines, 

 and a brown zone just below the middle of the last whorl ; whorls 

 somewhat rounded, decussately striated throughout, above and below 

 spirally corded ; aperture circular, interior showing the brown bands ; 

 lip whitish, the outer side scarcely expanded; ventral side broad 

 and thin. 



2. Cyclostoma filo-striatum, sp. nov. (Plate LIX. fig. 2.) 

 C. testa globoso-conica, solidiuscida, modice umbilicata, albida, 



ferrugineo tincta, custaneo spiraliter zonata ; anfractibus 

 rotundatis, malleatis, spiraliter obsolete liratis, concentrice 

 conspicue filo striatis, striis ad suturas subplicatis ; apertura 

 oblique circulari, intus castaneo-fusca ; labro albo rotunde 

 reflexo. 

 Hab. Madagascar. 



A globosely conical shell, rather solid, moderately umbilicated, 

 rusty white, banded with chestnut-brown zones ; whorls rounded, 

 with a malleated surface, spirally obsoletely ridged, concentrically 

 conspicuously thread-striated, the striae somewhat puckered at the 

 sutures ; aperture rather oblique, interior dark brown ; lip white, 

 rounded . 



Obs. Of much the same form and general appearance as the pre- 

 ceding, but with obvious differences, being a shell of more solid 

 growth, with a thickened rouudly reflexed lip; in sculpture, the 

 concentric thread-like strise taking the place of the spiral ridges, 

 which are predominant in C. balteatum. 



3. Cyclostoma consanguinelfm, sp. nov. (Plate LIX. fig. 3.) 

 C. testa depresse turbinata, ample umbilicata, griseo-albida, pur ■ 



pureo-griseo spiraliter fasciata, et infra peripheriam purpureo 

 fusco unisonata, transverse luteo flammea ; spira subacuta ; 

 anfractibus rotundatis, concentrice subtiliter striatis, spiraliter 



