1901.] MOLLUSKS FROM THE PEESIAN GULF. 445 



Clathtjeella o'maleti Melv, 



P.G. Grulf of Oman. On shell-growth on telegraph -cahle, 

 lat. 25° 58' N., long. 57° 35' E. 55 fathoms, mud. 



Clathueblla perplexa G. & H. Nevill. 



P.Gr. Bushire, and near Fao, at head of the Gulf. 



I. Bombay (Ahercrombie). 



Clathueella smithii G. & H. Nevilh 



P.G. Tumbl. M.C. Gwadur (W. T. Blanford). Near 



polynesiensis Eve. 



Clathueella tenuilieata Angas. 



P.G. Gulf of Oman, lat. 26° 10' N., long. 52° 50' E. 33 

 fathoms, mud and rock. 



Clathueella polynesiensis Eeeve. 



M.C. Astola Island, in sand. 

 I. Karachi. 



Not agreeing with Lifu specimens so named, and the species 

 requires further study. Arabian Sea examples certainly compare 

 more favourably with the original description (Proc. Zool. Soc. 

 1848, p. 119). ■ 



Clathueella pyeamidula Eve. 

 P.G. Linjah. 3| fathoms. 



I, Karachi. 5 fathoms, mud. 



Clathueella thalia sp. n. (Plate XXIV, fig. 10.) 

 C. testa fusiformi^ gracili, multum attenuata, ocliraceo-strmninea, ad 

 medium anfractuum hrunneo-tceniata ; anfractibus S, quorum duo 

 apicales vitrei, Iceves, pellucidi, his proximus anfractus ptdclier- 

 rime tribus gemmidaruni ordinibus minutis spiraliter dispositis, 

 prceditus, cceteris apudsuturas hnpressis, tumidis, longitudinaliter 

 costatis, costis tenuibus, Jleanwsis, obliquis, tribus vel quatuor 

 liris spiraliter succinctis, ad juncturas costarum gemmidiferis, 

 anfractu ultimo producto, attenuato ; apertura a^iguste oblonga, 

 labri sinu minima, brevissimo, lata; columella recta, canali brevi. 

 Long. 8"25, lat. 2'50 mm. 

 Hab. Mekran Coast, Cbarbar. 7 fatboms. 



This species might stand equally as Mangilia or Clathurella : it 

 seems impossible to draw a hard-and-fast line between such nearly 

 allied genera, the characteristics of which are often ill- defined. 

 C thalia is a particularly graceful, attenuate species, one of its 

 chief distinguishing peculiarities, which we have observed on no 

 other nearly allied form, being the beautiful rows (3) of spiral 

 small gemmse on the whorl immediately succeeding the apical. The 

 thin flexuose oblique longitudinal ribs, crossed by about four rows 

 of spirals on the upper whorls, present at the point of junction 

 with the ribs round small gemmules ; the last whorl is very elongate 

 and attenuate, just above the middle of this whorl the spirals are 

 sparse and the colour becomes whitish, giving the shell a banded 



