MANUAL OF THE MOLLUSCA. 17 



PLATE XVII. 



* The figures marked are left valves ; (interiors) . 

 Avicididce. 



PAGE 



1. Gervillia auceps, Desh. i. Neoconiian; Brit 262 



2. Perna ephippium, L. i. W.Indies 263 



3. luoceramns sulcatus, Park. |. Gault, Brit 263 



Mytilidce. 



4. Mytilus smaragdinus, Chemn. i. India 264 



5. Modiola tulipa. Lam. i. Brit 265 



6. pelagica, Forbes. \. S.Atlantic 266 



7. lithophaga, L. i. Medit 265 



8. Crenella discors, L. Brit 266 



9. Dreissena polymorpha, Pallas. |. Brit 266 



Arcad(S. 



10. Area granosa, L. f. Australia 267 



11. pexata, Say. i. S.Carolina 267 



12. {Bi/sso-arca)^ovi,'L. f. Medit 267 



13. zebra, Sw. \: Australia 267 



14. Cucullaea concamerata, Martini, i. India 268 



15. Macrodon Hirsoneusis, D'Arch. sp. g-. Bath Oolite, Brit 268 



16.*Pectunculus pectiniformis, Lam. f. India 268 



17.*Limopsis aurita, Broc. sp. Crag, Suffolk 268 



18. Nucula Cobboldiffi, Sby f. Crag, Norwich 269 



19.*Nuculina miliaris, Desh. ■^. Eocene, Paris 269 



20.*Leda caudata, Donov. Brit 260 



21.* {Yoldia) myalis, Couthouy. f. Crag, Norwich 270 



22.*Solenella Norrisii, G. Sby. f. Valparaiso 270 



23. — oruata, G. Sby. sp. f. Miocene, Patagonia 270 



Trigoniada. 



24.*Trigonia costata. Park, k- Oolite, Brit 271 



25. Myophoria decussata, Miinst. sp. Trias, Tyrol 272 



26. Verticordia cardiiformis, Wood. f. Crag, Suffolk 304 



