346 MESSRS. MEL VILL AND STASTDEN ON [June 18, 



CrCLOSTBEMA EBURNEUM Nevill. 



P.Gr. Bushire, Eishire, Kishen Island. 



M.C. Charbar. 7 fathoms, sand and mud. 



Assuming our identification to be correct, we fail to appreciate 

 the real distinctness of this species, described by Nevill from the 

 Bay of Bengal, from the original type of the genus, G. cancellatum, 

 as founded by the late Captain Marryat ', Trans. Linn. Soc. 1818, 

 vol. xii. p. 338. 



Ctclostbema micans a. Ad. 



I. Karachi. Bombay (Abercrombie), under name Liotia pul- 

 cliella Dkr. 



Ctclostbema oorinium ^ sp. n. (Plate XXII. fig. 1.) 

 C. testa umbilicata, alba, delicata; anfractibus quatuor, quorum 

 apicalis vitreus, mamillatus, ad apicem ipsum depressus, apud 

 suturas pauUum canaliculatis et ecvcavatis, longitudinaliter 

 arctissime et pidcherrime costulatis, costulis angulatis, ad 

 angulos gemmulatis, ultimo anfractu quinque-angulato, simul ac 

 circa regionern umbilicarem fortiter spiraliter angidatim gemmu- 

 lifero, deinde costidis longitudinalibus in umbilicum ipsum 

 descendeniibus ; apertura circulari, alba ; peristomate extus 7-8- 

 crenidato, continuo; margine columellari parum versus umbilicum 

 ecctenso, nitido, albo. 

 Alt. 2, diam. 3 mm. 



Hab. Persian Gulf, lat. 25° 44' N., long. 52° 30' E. ; on tele- 

 graph-cable, at 40 fathoms, mud and sand. 



This exquisite and very delicate Cyclostrema is slightly com- 

 parable with O. anaglyptum A. Ad., from Japan, but is smaller, 

 not so conical, and destitute of spiral ribs. The longitudinal rib- 

 lets are very close and fine, say 26 in number on the basal wboi-1, 

 five-angled, that surrounding the umbilicus at the base being the 

 strongest and most conspicuous. Regular rows of shining 

 gemmae on the costulae at the point of the angular projections 

 take the place of spiral lirse ; the interstices are plain, vitreous- 

 white; mouth circular, peristome continuous, outer lip crenulate ; 

 columellar margin not reflexed over the umbilicus, which is deep 

 and conspicuous. 



Ctclosteema quadeioaeinatum, sp. n. (Plate XXII. fig. 2.) 



C. testa depressa, straminea, umbilicata, solidula; anfractibus 3-|-, 

 apicali depressulo, vitreo, caiteris longitudinaliter undique 

 arctissime sub lente tenuistriatis, ultimo rapide accrescente, acute 

 quadricarinato J peristomate extus sexangulato, incrassato, con- 

 tinuo ; operculo corneo, multispirali. 



Alt. 1, diam. 2*25 mm. 



Hab. Gulf of Oman, lat. 24° 49' N., long. 55° 56' E. 

 225 fathoms, sand and mud. 



^ Captain Francis Marryat, E..N., the famous novelist, only known to have 

 described one other species — Mitra sonata, from the Mediterranean. 

 ^ oKjQts, a projection. 



