142 



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

 Humph. M.S. ined. 



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

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

 albis, fusco-marmoratis ; sutura profunda ; apertura circulari ; 

 peritremate interno tenui, levatiuseulo, luteo, externo reflexo, 

 dilatato-patente ; umbilico parvo. 



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

 gradually tapering acuminated spire, whose apex is decollated ; 

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

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

 aperture circular; internal peritreme slender, rather elevated, 

 yellow, external reflected, spreading ; umbilicus small. 



Jamaica. 



14.3. C. stjbasperum. (pi. xxviii. f. 159.) Lister. Cistula 

 decussata, Humphrey. M.S. ined. 



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

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

 striatis; sutura distincta; apertura subelliptica, disjuncta, 

 peritremate subrevoluto, latere anfractus ultimi non continue ; 

 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 striae ; suture distinct ; aperture 

 rather elliptical, separated, with a somewhat revolute peri- 

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

 aperture towards the 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. artic ULAT0M. (pi. xxviii. f. 160. 161.) nob. 



T. oblonga, pyratnidali, spira subacuminata, plerumque 

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

 albidis, et articulatlm fusco-marmoratis ; sutura distincta ; 

 apertura 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 — 7, (4 or 5 when 

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

 whitish marbled with fuscous, and having an alternately white 



