1906.] mollusks from the persian gulf. 797 



Barbatia lactea (L.). 



I. Bombay [Abercrombie). 



Includes B. zebuensis Reeve. 



Likewise native of European seas, including Great Britain. 



Barbatia nivea (rmel. 



P.G. Dabai. 8 fathoms (1903). 



Barbatia (Acar) avellanaria* Melvill, sp. n. (Plate LTY. 

 fig. 3.) 



B. testa cdba, solidula, oblonga, lateribus amhobus leniter mar- 

 ginerti apud ventralem rotimdatis, joara^/eZa, siqyerficie omni 

 arete et pulcherrime cancellata^ jjostice costis radiantibiijS 

 magis pro7ninuUs, majoribus, sub lente geminulatis : pagina 

 inttts alba, marginibus undique fiinbriolatis ; dentibus crassis, 

 normalibus. 

 Alt. 4, lat. 7, diani. 3 I'um. 



Hah. Persian Gulf : Gulf of Oman. Lat. 24° 58' N., long 5(> 

 54' E. ; 156 fathoms, shell-sand. 



An abundant sj^ecies, of compact growth, and close cancellation, 

 excepting posteriorly, where six or seven pi-ominent ribs extend 

 radiately, the interstices being free and clearly defined. 



Barbatia (Acar) gradata Brod. & Sowb. 

 P.G. Very local. 



Barbatia (Acar) margareth^e Melvill. sp. n. (Plate LIY. 

 fig. 5.) 



B. testa parva, incrassata, incequilaterali, ceqtdvalvi, oblique tra- 

 peze idea, lUrinque obtuse angulata, postice elongata, margin e 

 dorsali et ventrali p>arallelis, superficie om,ni arete et ptd- 

 eherrime eaneellata, et radiatim regidariter imbrieato-costellata: 

 pagina intus alba: eardine deiitibiis j^aueis, eirca 16 i^ridelieet 

 11 post ids, 5 antieis) jyra'dito. 

 Alt. 5, lat. 8, diavi. 3 mm. (sp. maj.J. 

 „ 3, „ 4, „ 1-5 „ (sp. mill.). 

 Hab. Persian Gulf : Gulf of Oman. Lat. 24° 58' N., long. 56"^ 

 54' E. ; 156 fathoms, often attached to Serpulse (fee. 



A highly decorated little Acar, we think full-grown. Allied to 

 A. dominge^isis Lamk., but the imbricated concentric cancella- 

 tions are of much finer grain and texture. At the request of 

 Mr. Townsend we associate with this beautiful shell the name 

 of Mrs. Margaret Whitby-Smith, who has taken much kindly 

 interest in this and other discoveries made by him. 



Barbatia (Acar) sculptilis Reeve. 

 I. Karachi (Major Baker). 



* AveUana, a hazel-nut. 



