792 MESSRS. MELVILL AND STANDEN ON [Nov. 13, 



dissociate these Persian Gulf examples from the common 

 European species. 



ISTUCULA RUGULOSA Sowb. 



P.G. Gulf of Oman. Lat. 27° N., long. 52° E. 

 Amongst shell-growth on the telegraph-cable, at 40 fathoms, 

 mud bottom. 



Leda bellula a. Ad. {Nuculana Link.) 

 I. Karachi, very sparingly. 



Leda brookei Hanley. 



M.C. Oharbar. Shell-sand ; 40 fathoms. 



I. Bombay [Ahercrombie) ; one or two specimens only. 

 Distrib. Borneo. 



Leda fragilis (Ohemn.). 



P.G. Shaikh Shuaib Island. 3 fathoms, mud and sand. 



Leda mauritiana Sowb. 



M.C. In many soundings at from 10 to 50 fathoms, mostly 

 on mud bottom. 



I. Bombay {Abercromhie). 



YOLDIA CLARA Melv. 



P.G. Bushire. 4 fathoms, mud. 



YOLDIA LEPIDULA A. Ad. 



P.G. Lat. 27° 18' N., long. 51° 52' E. Dredged from muddy 

 bottom at 27 fathoms. 



I. Off Karachi. 15 fathoms, mud. 

 In range extending to Borneo. 



YoLDiA MCOBARiCA (Cliemn.). 



P.G. Gulf of Oman. Lat. 26° 23' N., long. 54° 53' E. ; mostly 

 at 25 fathoms. 



I. Bombay [Abercrombie), rare. 

 Occurs as far south as Ceylon. 



YoLDiA SEROTiNA Hinds. 



P.G. Gulf of Oman. Lat. 25° 58' N ., long. 57° 03' E. ; 55 fathoms, 

 mad. Among shell-growth on telegraph-cable. 

 Ranges as far east as Borneo. 



YOLDIA TENELLA Hinds. 



P.G. Gulf of Oman. Lat. 24° 50' N., long. 65° 49' E. 



YoLDiA TROPICA Melv. 



P.G. Gulf of Oman, Maskat. 1 5 fathoms ; large. 



