MiaVILL : ON CYCLOSTKEMATIDiE AND LIOTIIMC. 23 



prseditis, superficie omni radiatim arctissime striata, apertura circular!, 

 intus alba, peristomate paullum incrassato, fere continuo. Alt. 1'25, 

 diam. 3 mm. 



Mab.—Guli of Oman, lat. 24°58'N., long 56°54'E., 156 fathoms. 



The whole surface of this little species, which is typically and most 

 frequently furnished with nine spiral carinse on the body- whorl (of 

 which the sutural and inner umbilicar keels are but weakly developed), 

 is minutely radiately, very closely striate, giving it a shagreened and 

 silky appearance. 



Though not quite so abundant as C. 5-carinatum, it occurs very 

 frequently in the above dredging, but I have not yet noticed it from 

 other localities. 



11. Cyclosteema ocrinium, Melvill & Standen. 

 Cyclostrema ocrinium, Melvill & Standen : Proc. Zool. Soc, vol. ii 

 (1901), p. 346, pi. xxii, fig. 1. 



^tf 5.— Persian Gulf, lat. 25° 44' N., long. 52° 30' E. ; likewise on 

 the telegraph cable at 40 fathoms, mud and sand. 



I copy the remarks written by myself at the time of description : 

 " This exquisite and very delicate Cyclostrema is slightly comparable 

 with C. anaglyptum, A. Ad., from Japan, but is smaller, not so 

 conical, and destitute of spiral ribs. The longitudinal riblets 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 costulae 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." 



12. Cyclostrema prominulttm, Melvill & Standen. 

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

 vol. xii (1903), p. 292, pi. xx, fig. 6. 

 Eah.—Gnli of Oman, lat. 24° 58' N., long. 56° 54' E., 156 fathoms. 

 One of the rarer species, of which but two or three specimens have 

 occurred. It is conspicuous for being unusually strongly carinate at 

 the periphery of the body-whorl, the rest of the surface being 

 uniformly multilirate. 



13. Cyclostrema quadri-carinatum, Melvill & Standen. 



Cyclostrema quadri-carinatum, Melvill & Standen : Proc. Zool. Soc, 

 vol. ii (1901), p. 346, pi. xxii, fig. 2. 



Sah.—Gnli of Oman, lat. 24° 49' N., long. 55° 56' E., 225 fathoms, 

 sand and mud. 



This small shell, four-keeled only on the body-whorl, has not yet 

 been found elsewhere. We have till lately confouuded it with the 

 next species now to be described, and to which it bears a superficial 

 resemblance. The remarks made (Ann. & Mag. Nat. Hist., vol. xii, 

 1903, p. 293) as to the frequency of C. quadri-carinatuni must 

 therefore be erased. 



