18 MANUAL OF THE MOLLUSCA. 



PLATE XVITI. 



* The figures marked are left valves. 

 TJnio ill cite. 



PAGt 



1. IJnio litoralis, Drap. \, Auvergne 274 



2. {Monocondylcea) Paraguayanns, D'Orb. \. S. America... 274 



3. Castalia ambigua, Lam. \. R.. Amazon 275 



4. Hyria syrmatopliora, Grouov, \. S. Americaf 274 



5, *Iridina exotica, Lam. \. Africa, E,. Nile 275 



6. Mycetopus soleniformis, D'Orb. \. S. America, R. Parana 275 



7. iEtheria semilunata, Lam, \. Senegal 275 



ChamidcB. 



8. Chama macropliylla, Chemn. \. Antilles 276 



9. left valve 



10. Diceras arietinum, Lam. \. Coral-Oolite, France 278 



IL leftvcdve , 278 



12. (i2^jM?V«zfl') Lonsdalii, J. Sby. \. Neocomian, Spain — Brit. 279 



Hi-ppuritidce. 



13. Caprotina striata, D'Orb. U. Green-sand, Prance 289 



]4. leftvalve ■ 289 



Tridacnidce. 



15. Tridacna squamosa, Cbemn. i. Bombay 290 



16. Hippopus maculatus. Lam. k- N.Australia 290 



CardiadcB (part). 



17. Lithocardium aviculare, Lam. ^. Eocene, Paris 291 



CyprinidiB (part). 



IS. Cardilia semi-sulcata, Lam. Amboina 301 



19.*Megalodon cucullatus, J. Sby. ^. Devonian, Eifel 301 



t The animal of Hyria has two siphonal orifices. 



