1906.] IVKJLLUSK.S FROM THE PERSIAX GULF. 825 



-Semele regularis E. a. Smith. 



I. Bombay (Ahercrombie). Likewise in very poor condition, 

 but agreeing with Austrahan examples of regularis in the Biitish 

 Museum (Nat. Hist.). 



CUMINGIA OOOATILLA Melv. 



Citminyia occatilla Melv. Ann. & Mag. N. H. ser. 7, vol. vii. 

 p. 555, pi. ix. fig. 5. 

 M.C. Near Oharl)ar. 

 Also from A/len (E. R. ShoplMiid). 



iSv'XDESMYA ciSTULA Melvill, sp. n. (Syndosm/tja auct.) (Plate 

 LVI. fig. 6.) 



S. testa albo-lactea, tenui, semipellacida, nitida, ovato-trigona, 

 transversim elongata, fere mquilaterali^ inaiquivalvi ; valva 

 sinistra magis convexa, postice prolongata, attenuata, antice 

 rotundata, inargine djOrsali utrinqite leniter deelivi ; umbonihas 

 actctis, promimdis, ligame?ito interno; cardiae foveam obliqtmm 

 proibente, derde cardinali centralis piarvo, inter dam hifldjO ; 

 paglna iatiis albo-lactea, niietite. 

 Alt. 8, lat. 10, diara. 5 mm. 



Ilab. Persian Gulf : Oulf of Oman. Lat. 2^" 58' N., long. 56"" 

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



Fairly frequent, but in imperfect condition. The valves are 

 nne(iual, the left l)eing far more convex. In general aspect not 

 unlike the British species >S'. prismatica Mont, ov S. opalina Hinds, 

 occurring at Bombay. Abra, the generic term applied by 

 Dr. Leach in 1818, does not seem to have been properly 

 characterised. 



.Sv'NBESMVA OPALIXA Hinds. 



I. Bombay (Abercrombie). 



In range extending to Japan. 



N.B. — Abra maxima (Sowerby) was di'edged by the s.s. ' Inves- 

 tigator' at 1000 fathoms off the Mekran Coast, and at 1 299 fnthoms 

 in the Gulf of Oman. 



Earn. DoxACiD.E. 

 DoxAx (Hecuba) scortum L. 

 M.C. Charbai'. 



I. Karachi, upon Manora beach. Bombay {Abercrombie). 

 Bombay southwards to Goa [Lt.-Col. H. D. Olivier). 



Mr. Townsend especially signalises finding a, young specimen 

 wliich shows much beauty of concentric la.mellation. This is 

 probably D. pubescens L., now considered a vai-iety of scortum. 



DoNAX (Serrula) aperittus Melv. 



I. Karachi. 



.\lso recentlv recorded from Aden {Shoplandj). 



55* 



