EXPLANATION OF THE PLATES. 539 
PLATE XX. 
(All the interiors are right valves.) 
Cyprinide. 
Page 
meersiaevopilcata, Da Costa. Brit. ....0..0cccesccc cedcesus 464 
2, Circe corrugata, Chem. 4. Red Sea .................00e 464 
Pept AUC ON Lie oe MTU ioe acs twa ahcrs e Goo aide sw aleiorele ajere ite 466 
4. Cypricardia obesa, Reeve. % India ........seeeee ses os a EO 
peesroue calyculata, L. S.Africa .)....0seiscecss seit wo cenes 471 
6. ( Venericardia) ajar, Adans. W. Africa ............ 472 
Veneride. 
Peerinepeniia., Li. We. UGGS < o ..es cto es wee wee s ches olla ae 473 
Seeewtnerea dione, Ty. 2. W. Indies .:...... 0. 0s000 eee be 474 
9. ———— (Were) picta, Schum. %. China..............0. 474 
10. ———— (Trigona) tripla, L. 3%. W. Africa ..........00. . 474 
11. ——— (Grateloupia) irregularis, Baster. 3. Miocene, Bor- 
PETERS ce soit aie’ aisare SU ROE Oe BRAS OE Ge siehese Geoaboouottve 474 
Pemoreuusoxoleta, 1. 2. Brit.) w.cscescceduses cececies oo. 474 
13. Lucinopsis undata, Pennant sp. Brit. tytn eee nee enes we 475 
Pemnanedmullasira, Wood. 14, Brit... 2.008 caccse es waeceons 475 
15. Venerupis exotica, Lam. N. Australia...........26.--000- 476 
16. Petricola lithophaga, Retz. Medit. .......... aie, aerabeo tee 476 
17. ——-—— pholadiformis, Lam. 2. New York ............ 476 
18, Glaucomya Chinensis, Gray. China.......... Sleistaaeinieeee 477 
19 
. Capsula rugosa, Lam. sp. 3. N.Australia......cesscseeeee 481 
