PLATE XIX 



PELECYPODA: EULAMELLIBRANCHIA 



D. Veneracea 



i. Venus paphia, Linn. 



2. Mevetrix dione, Linn. 



3. Dosinia exoleta, Linn. 



Other Veneracea are shown on Plate XVI., Fig. 2 ; 

 Plate XXXII. , Fig. 15. 



E. Cardiacea 



4. Cardium lyratum, Sby. 



5. Hippopus maculatus, Lamk. 



Another example of the Cardiacea is shown on Plate XVI., Fig. 1. 



F. Chamacea 



6. Chama macrophylla, Chemn. : a, right valve ; b, left valve. 



7. Monopleura imbricata, Math. : I., line of ligament. 



G. My ace a 



8. Psammobia squamosa, Lamk. 



9. My a truncata, Linn. 



10. Panopea Americana, Conrad. Fossil : Miocene. 



11. Lutraria oblonga, Gmel. 



12. Corbula sulcata, Brug. 



13. Ensis siliqua, Linn. 



14. Saxicava rugosa, Linn. 



15. Rocellaria dubia, Penn. 



16. Gastrochana mumia, Speng. The true shell is shown lying at the 

 bottom of the shelly lining to the burrow, the lower portion of which 

 has been laid open for the purpose. Just above the shell there is a 

 curious perforated diaphragm across the burrow, a portion of which is 

 shown. 



Other Myacea are shown on Plate XV., Figs. 4 and 7 ; 

 Plate XXX., Fig. 8. 



%* All Figs, from drawings by S. P. Woodward. 



