190(5. J MOX.LCSKS FROM Till-: PKHSJAN GULF. 



827 



FiLui . Mesouesmatide^:. 



Ehvilia soaljola Issel. 



P.G. Kais IslMn<l, 7-15 fjitlioms ; Sliaikli Shuaib Islarul, 

 12 fathoms; Bahrein Isles. 



Gulf of Oman. Lat. 24^-- 58' N., long. 56'^' 54' E. ; 156 fathoms, 

 shell-sand. Small, but well coloured and perfect examples ; while 

 two unicolorous perfect shells occmred in shell-sand off OharV^ar 

 at 40 fathoms. These may perhaps belong to a different species. 



Ervilia purpurea Desh. 



P.G. Henjam Island, 10 fathoms. 



One or two specimens determined as E. scaliola were, perhaps, 

 more nearly referable to this Erythraean species. 



Mesodesma (Paphia) hahreixexse, sp. n. (Plate LIII. fig. 7.) 

 M. testa alha, kiivigata, suhtrapezoidea, inasquilaterali, antice 

 rot ancle elongata, postice truncatula ; umbonihus parvis, 

 contiguis, ligamento interno ; dentihus cardinalihus, simul ac 

 latercdibas, magnis, crassis ; pagina interna alha, nitida, 

 iinprfessione muscidari conspicaa ; linea palliali slmoata. 

 Alt. 18, lat. 25, diam. 10 mm. 

 Hah. Bahrein Isles, Persian Gulf. 



This species has been veiy closely compared with all the other 

 known forms of PapJda, and assimilates most closely to P. gla- 

 ir ata Desh., differing mainly in the posterior region, the margin 

 being more decidedly truncate. 



Fam. Mactrid/e. 

 Mactra achatina Chemn. (=a.s/>er.s« Dkr.). 

 I. Angrias Bank {('apt. Tindall). 



Mactra aphrodixa Desh. 



P.G. Gulf of Oman, Jask. Dredged at 5-10 fathoms, mud 

 and sand. 



Mactra cornea Desh. 



I. Karachi. Bombay (Abercrovible). 



Mactra fauroti Jouss. 



[. Karachi. Dredged at 5 fatlioms, sand. 



Mactra glabrata L. 



I. Karachi. With the last-mentioned, at same dejjth (5 

 fathoms). 



Mactra luzonica Desh. 



I. BomVjay (Abercrombie), abundant. Also we have seen 

 specimens from Madras {Henderson) and Calcutta {Ladjj 

 Herschel). 



