FAMILY 16. CARDIID/E. 



22 C. tumoriferum. 



23 C. unedo. Linnasus. 



24 C. vertebratum. Jonas. 



GENUS. CAilDIUM. Linnams, 1758. 

 Australia. 

 Eastern Seas. 

 E. Coast of Africa. 



European Seas. 



* 

 



California. 

 Ceylon. 

 China. 

 Philippines.* 



99 



China. 

 Ceylon. 



China, &c. 

 Exmouth, Devon. 

 Zanzibar. 

 Britain. 

 Ceylon, &c. 

 Adriatic Sea. 

 a New Holland. 

 b Mauritius. 

 New Holland. 

 a Rogers' Straits. 

 b Ceylon, &c. 

 Australia. 



SirW.Denison. 



FAMILY 17.-ISOCABDDDJE. 



GENUS. ISOCARDIA. Lamarck, 1799. 

 1 I. vulgaris. Reeve. China. 



FAMILY 18. CHAMHXE. 

 GENUS.- CHAMA. Bruguiere, 1789. 

 1 C. multisquamosa. Reeve. Philippines. 



FAMILY 19. TRIDACXID^. 



GENUS. TRIDACXA. Bi-uguiere, 1789. 



1 T. Cumingii. Reeve. Andamans. 



2 T. elongata. Lamarck. a Australia. 



b Philippines. 



SirW.Denisoii, 

 M. Robillard. 



SirW.Denison 



Lieut.McGoun. 

 SirW.Denison, 



