814 MESSUS. MELVILL AND STANBEN ON [Nov. 13, 



Mytilicarbia vakiegata (Bvug.). 



I. Karachi. At half -tide among rocks. 



Fam. Crassatellidvi;. 

 Crassatella indica E. a. Smith. 

 P.G. Near Dabai, and in deeper water in the Gulf of Oman. 



Crassatella picta Ad. & Reeve. 



P.G. & M.O. At intervals, and occurring mostly singly, not 

 common. 



Crassatella radiata Sowb. 



P.G. Gulf of Oman, Maskat ; 1 5 fathoms, muddy sand. A larger 

 variety occurs, lat. 26° 50' X., long. 54° 50' E.; 10 fathoms, sand. 



N.B. — Crassatellites omanensis Smith, from 230 fathoms in the 

 Gulf of Oman, was acquired during the 'Investigator' Expedition's 

 recent cruise. 



Fam. CYPRINIDiE. 



Isocardia (Meiocardia) cumingii a. Ad. 



P.G. Gulf of Oman. Lat. 25° 23' K., long. 58° 36' E., 

 40 fathoms ; lat. 25° 04' N., long. 60° 20' E., 60 fathoms ; and 

 lat. 24° 58' N., long. 56° 54' E., 156 fathoms : shell-sand. 



Isocardia (Meiocardia) lamarckii Reeve. 

 P.G. Rare ; one or two valves. 



LiBiTiNA solenoides Reeve { = Cypricardia Lamarck, 1819). 

 I. South of Bombay, near Ratnagiri {Lt.-Col. H. D. Olivier). 

 Perhaps only a variety of the next species. 



LiBiTiNA vellicata Reeve. 



P.G. (il/fyor Baker.) 



I. Karachi. On rocks at low tide off Beach Fort, Manora. 

 Bombay {Abercrombie). 



Basterotia arcula Melv. 



I. Karachi. 3 fathoms, mud and sand. 



A very distinct species the valves being of a remarkably 

 profound arciform depth. 



Fam. LuciNiB^. 

 LuciNA borealis (L.). 



P.G. Small, and highly coloured. Almost certainly a tropical 

 variety of this widely-distributed British and European species. 



Lucina dentifera Jonas. 



P.G. Gulf of Oman, in several places, especially at Malcolm 

 Inlet (Kubbat or Ghobat Ghazira), 24 fathoms, mud. Often 



