1901. J MOLLUSKS FEOM THE PERSIAN GULF. 413 



Xassa (Xiotha) sti-rtiaxa, sp. n. (Plate XXIII. fig. 14.) 

 N. testa ovato-fusiformi, versus a pieem attenuata, albo-calcarea vel 

 paUide fusea, baud nitente, d< licata : anfiraetibus novem, quorum 

 apicales quatuor vitrei, perlawes, spiraliter sub laite pulchre 

 uniearmati apud medium, interdum fusco-tineti, eateris apud 

 suturas impressis, infra, juxta suturas, spiraliter fortiter uni- 

 suleatig, hngitudinaliter mutiicostatis, corns obliquis, interdum 

 lavibus, nitidis, intersHtiis regulariter transversim sulculosis, 

 interdum omniao cancellatis, uUimi anfractus costis triginta U 

 quatuor, ad basim ipsam descendentibus, illic dorsaliter fortiter 

 transversim sulculosis; apertura ovata, einereo-alba, labro paid- 

 in, n effuso. iittus 10-11-dentieulato, baud multum inerassato ; 

 columella nitida, albida, nequaquam callosa; canali lato, brevis- 

 simo, pauUulum reeurvo. 

 Long. 18, lat. 9 mm., spec. ma/. 



Hab. Gulf of Oman. Lat. 24° 55' ]S T ., long. 57° 25' E. ; 87 

 fathoms, sand and mud. Lat. 24° 49' X., long. 55° 56' E. ; 225 

 fathoms, mud. 



A distinct Xiotha, dull calcareous-white, or pale fuscous ; nine- 

 whorled, the four apical glossy, once delicately transversely keeled, 

 the remainder either uniformly cancellate, or with the many 

 close longitudinal ribs smooth and the interstices finely sulculose ; 

 just below the sutures in each whorl there is a strong deep apical 

 sulcus. The mouth is oval, outer lip not very thick, within with 

 ten or eleven denticles or raised striae. Columella white, rather 

 thin, shining, never callous. Canal very short, slightly recurved. 

 A good many examples dredged at the contiguous soundings 

 given above. 



We have unusual pleasure in associating with this most interest- 

 ing species, at Mr. Townsend's request, the name of his and our 

 friend, Mr. "W. Neville Start, of the India Office. 



Nassa (Phrontis) fissilabeis A. Ad. 



P.G., M.C., generally. 10 fathoms, coral-sand. But always 

 local. 



Nassa (Hima) dermestina Grid. 



M.C. Generally distributed along the coast of Baluchistan. 

 From 3-10 fathoms. 



I. Karachi. Among loose stones and sandy mud. 



Nassa (Hima) fhederici, nom. nov. 



Nassa (Hima) townsendi Melv. Mem. Manch. Koc. vol. xli. part 

 iii. (±897), no. 7, p. 4, pi. <>. fig. l(now Dall). 



P.G. On Cable, 40 fathoms, mad. 



M.C Generally distributed, bat not abundant. 



The original came having been antedated, we have ventured to 

 ociate with this species the Christian oame of Mr, Frederick 

 VV. Townsend. 



