1901.] HOLLUSKS FROM THE PERSIAN GULF. 445 



Clathurella cvmaleti Afelv. 



P.G. Gulf of Oman. On shell-growth on telegraph -caMe, 

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



Clathurella perplexa G. & H. Nevill. 



P.G. Busbire, and near Eao, at head of the Gulf. 



I. Bombay (Ahercrombie). 



Clathurella smithii G. & H. Nevill. 



P.G. Tumbl. M.C. Gwadur (IF. T. Stanford). Near 



polynesiensis Eve. 



Clathurella tenuilirata Angas. 



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

 fathoms, mud and rock. 



Clathurella polynesiensis Beeve. 



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). * 



Clathurella pyramldula Eve. 

 P.G. Linjah. 3| fathoms. 



I. Karachi. 5 fathoms, mud. 



Clathprella thalia sp. n. (Plate XXIV. fig. 10.) 



C. testa fusiformi, gracili, multum attenuata, ochraceo-straminea, ad 



medium wnfractuum brunneo-toniata ; anfraetibus 8, quorum duo 



apicales vitrei, losves, pellucidi, Ms proocimus anfractus pidcher- 



rime tribus gemmxdarum ordinibus minutis spiraliter dis/iositis, 



pr&ditus,cceteris apud suturas imprcssis, tumidis, longitudinaliter 



costatis, cost is tenuibus, Jleccuosis, obliquis, tribus vel quatuor 



liris spiraliter succinctis, ad juneturas costarum gem/imulif ris, 



anfractu ultimo producto, attenuata ; apertura anguste oblonga, 



labri siiiu minimo, brevissimo, lato ; columella recta, canali brevi. 



Lowj. 8*25, lat. 2'50 mm. 



Hab. Mekran Coast, Charbar. 7 fathoms. 



This species might stand equally as Mam/ilia or Clathurella : it 



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



allied genera, the characteristics of which arc 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 gemma mi tin; u borl immediately succeeding the apical. The 



thin flexuose oblique longitudinal ribs, crossed by about four rows 



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



with the ribs round small gemmtues; 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 



