MliLVlLL: ON CYCLOSTREMATID.E AND LIOTIID^^. 21 



lu conclusion, I would tender my best acknowledgements to 

 Mr. R. Bullen Newton, F.G.S., for information as to fossil species 

 of the families under discussion ; likewise to Mr. Edgar A. Smith, 

 I.S.O., and Mr. Ernest R. Sykes, F.L.S. 



Family CYCLOSTREMATID^. 



Genus CYCLOSTREMA, Man-yat.» 

 1. CrcLOSTREMA ANNELLARiuM, Melvill & Staudcn. 



Cyclostrema annellarium, Melvill & Standen : Ann. & Mag. Nat. Hist., 



vol. xii (1903), p. 292. 



Eal.—(a\x\i of Oman, lat. 24° 58' N., long. 56° 54' E., 156 fathoms. 



Distinguishable by its rounded longitudinal riblets, twenty-four in 



number on the last whorl, the interstitial surface being microscopically 



spirally striate. 



2. Cycl-osteema carinatdm, H. Adams. 



Cyclostrema carinatum, H. Adams: Proc. Zool. Soc, 1873, p. 207, 

 pi. xxiii, fig. 8. 



jK?5.— Persian Gulf, lat. 26° 44' N., long. 52° 30' E., on telegraph- 

 cable, 40 fathoms, sand and mud ; also Gulf of Oman, lat. 24° 58' N., 

 long. 56° 54' E., 156 fathoms. 



A solid though small species, many spirally ribbed, with smooth 

 interstices, the ribs being incrassate. Mouth on slightly oblique plane. 

 Not very abundant. 



3. Ctclostkema ciNGtJLATUM, Duuker. 

 Cyclostrema cingulatmn, Dkr. : Malak. B-latt., vol. vi, p. 225. 

 ,, Dunkeri, Tryon: Man. Conch., vol. x, p. 91. 



J?rt5.— Persian Gulf; Gulf of Oman, lat. 26° 23' N., long. 54° 55' E., 

 25 fathoms, sand; also Bombay (Abercrombie, 1892). 



A somewhat obscure species, thrice strongly cariiiate on the 

 periphery, below the suture, and around the umbilicus. Shell 

 shining, white. The name cingulatum has been several times 

 employed in this genus. It is a question whether Dunker or Philippi 

 in this have priority. 



4. Cyclostrema cinguliferum, A. Adams. 



Cyclostrema cinguliferum, A. Adams: Proc. Zool. Soc, 1850> p. 43. 



Hub. — Karachi. 



A species with six acute ribs on the last whorl, white, deeply 

 umbilicate, discoidally depressed. Not common. 



5. Cyclostkema eburneum, Nevill. 

 Cyclostrema eburneum, G. & H. Nevill : Journ. Asiat. Soc. Bengal, 

 vol. xliv, pt. 2, p^ 101, pi. viii, figs. 21, 22. 

 Hal. — Persian Gulf: Bushire, Reshire, Kishm Island. Mekran 

 Coast : Charber, 7 fathoms, sand and mud. 



' Trans. Lima. Soc, vol. xii. (1818), p. 338. 



