542 MAinJAL OF THE MOLLTJSCA. 



PLATE XXIII. 



* The interiors marked are left valves. 



Myacidce. 



Page 

 l.*Mya trtmcata, L. \. Brit 489 



2. Corbula sulcata, Lam. W. Africa 490 



3. {Fotamomya) labiata, Maton sp. A. Buenos Ayres 490 



4. {Sphenia) Bingliami, Turt. Brit 490 



0. Nesera cuspidata, Oli^d. Brit 491 



6. Anatinella Candida, Ch.enm. A. Ceylon 479 



Anatinida. 



7. Anatina subrostrata, Lam. |-. India 495 



8. CocKLodesma pr83tenue, Mont. Brit 495 



9. Thracia pubescens, Pult. J. Brit, 496 



10.*Lyonsia Norvegica, Chemn. sp. f. Brit 498 



11. Pandora rostrata, Lam. f . Gruernsey 499 



12. Myodora brevis, Stutcb.. New South Wales 499 



13. Myocbama anomioides, Stutcli. New South Wales 499 



14. Chamostrea albida, Lam. sp. \. New South Wales 500 



Gastrochcenidce. 



15. Gastrochsena modiolina, Lam. Gal way 501 



15a. sp. siphonal orifices, in U. Greensand, Haldon, 



Devonshire 501 



16. mumia, Spengl. A. India 501 



17. Clavagella bacillaris, Desh. J. Pliocene, Sicily ., 502 



18. Aspergillum vaginiferum. Lam. -g-. Eed Sea 568 



Tholadida. 



19. Pholas Bakeri, Desh. f. India 504 



20. [Fholadidea) papyracea, Solr. f . Brit 505 



21. — {Martesia) striata, L. W. Indies 505 



22. [Farapliolas) bisulcata, Conrad 506 



23. Xylophaga dorsaHs, Turt. Brit 506 



24. 25. Teredina personata, Lam. London Clay, Bognor 507 



25a. siphonal orifice 



26. *Teredo Norvegica, Spengl. Brit 506 



27. -' siphonal end of the tube, broken to show 



septa S3 506 



28. pahnulata, Toxt. (styles). Brit 507 



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