346 MESSRS. MELVILL AND STANDEN ON [June IS, 



CYCLOSTREMA EBURNEDM Nevill. 



P.G. Bushire, Rishire, Kishen Island. 



M.C. Charbar. 7 fathoms, sand aud 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, C. cancellation, 

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

 vol. xii. p. 338. 



Cyclostrema micans A. Ad. 



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

 chella Dkr. 



Cyclostrema ocrinium \ sp. n. (Plate XXII. fig. 1.) 

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

 apicalis vitreus, mamillatus, ad apicem ipsum depressus, apud 

 saturas paullum canaliculatis et excavatis, longitudinaliter 

 arctissime et pidcherrime costulatis, costnlis angulatis, ad 

 angulos gemmulatis, ultimo anfractu quinque-anguldto, simul ac 

 circa regionem umbilicarem fortiter spiraliter angulatim gemmu- 

 lifero, deinde costidis longitudinalibus in umbilicum ipsum 

 descendentibus ; apertura circidari, alba ; p>enstomate extus 7-8- 

 crenulato, continuo; margine columella ri parum versus umbilicum 

 extenso, nitido, albo. 

 Alt. 2, diam. 3 mm. 



Hob. 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 0. 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 whorl, 

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

 strongest and most conspicuous. Regular rows of shining 

 gemmae on the costulse at the point of the angular projections 

 take the place of spiral lira? ; 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. 



Cyclostrema quadricarinatum, sp. n. (Plate XXII. fig. 2.) 



C. testa depressa, straminea, umbilicata, solidida; anfractibus 34, 

 apicali depressulo, vitreo, cceteris longitudinaliter undique 

 arctissime sub lente tenuistriatis, ultimo rapide accrescente, acute 

 quadricarinato ; peristomate extus sexangidato, incrassato, con- 

 tinuo ; operculo corneo, midtispirali. 



Alt. 1, diam. 2*25 mm. 



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

 225 fathoms, sand and mud. 



1 Captain Francis Marryat, R.N., the famous novelist, only known to have 

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



2 oKpis, a projection. 



