142 



142. C. piCTUM. (pi. xxviii. f. 157. 158.) Cistula picta. 

 Humph. M.S. iiied. 



T. oblongo-coiioidea, tenui, subpellucida, spira acuminata, 

 apice decollato ; anfractibus 4 — 5, ventricosiusculis, Isevibus, 

 albis, fusco-marmoratis ; sutura profunda; apertura circular! ; 

 peritremate interno tenui, levatiusculo, luteo, externo reflexo, 

 dilatato-patente ; umbilico jiarvo. 



Shell oblongo-couoidal, thin, somewhat pellucid, with a 

 gradually tapering acuminated spire, whose apex is decollated ; 

 volutions from 4 to 5, rather ventricose, smooth, white, marbled 

 with browii, principally at the lower part ; suture deep ; 

 aperture circular; internal peritreme slender, rather elevated, 

 yellow, external reflected, spreading ; umbilicus small. 



Jamaica. 



143. C. suBASPERUM. (pi. xxviii. f. 159.) Lister. Cistula 

 decussata, Humphrey. M.S. ined. 



T. oblongo-conoidea, spira elevata, decoUata; anfractibus 

 5 — 6, rotundatis, subfuscis, albido-marmoratis, decussatim 

 striatis ; sutura distincta ; apertura sul:)elliptica, disjuncta, 

 peritremate subrevoluto, latere anfractus ultimi non continuo ; 

 umbilico mediocri. 



Shell of an oblong shape, with an elevated, gradually taper- 

 ing spire, decollated at the apex, with 4 or 5 rounded volu- 

 tions, of a brown colour marbled with whitish, and wholly 

 covered with decussating striee ; suture distinct ; aperture 

 rather elliptical, separated, with a somewhat revolute peri- 

 treme, which, however, does not continue on the side of the 

 aperture towards tlie last volution ; umbilicus middle-sized. 

 This is one of the largest of the pyramidal Cyclostomata, much 

 resembling C. Labeo, from which it may easily be distinguished 

 by the disjoined aperture, and the peritreme not continuing 

 on the side towards the last volution. East Indies. 



144. C. ARTici'LATUM. (pi. xxviii. f. 160. 161.) nob. 



T. oblonga, pyramidali, spira sulDacuminata, plerumque 

 decollata; anfractibus 4 — 7? rotundatis, transversim striatis; 

 albidis, et articulatim fusco-marmoratis ; sutura distincta ; 

 ajiertura subcirculari ; peritremate angusto, reflexo ; umbilico 

 mediocri ; operculo testaceo, tenui, extus lamina spirali 

 conspicua. 



Shell oblong, pyramidal, with a subacuminated, though 

 generally decollated spire ; volutions 4 — /? (4 or 5 when 

 decollated, 6 or 7 when entire,) rounded, transversely striated, 

 whitish marbled with fuscous, and having an alternately white 



