PLATES.* 



PHOLADARIiE. LITHOPHAGI. SOLENACE^E. MYARIiE. 



Fig. 1 . Pholas coslata. 



a. b. the two hinges. 



c. one of the inner accessory 

 pieces. 



2. Gastrochoena cuneiformis. 

 a. front view of ditto. 



3. Saxicava veneriformis. 



4. Venerirupis crenata. 

 a. b. the two hinges. 



5i Petricola distans . 



a. outer view of the opposite 

 valve. 



6. Solen vagina. 



a. b. c. three hinges, shew- 

 ing each of Lamarck's divi- 

 sions of this genus. 



Fig. 7. Glycimeris siliqua. 



8. Sanguinolaria occidens. 



9. Panopcea Faujasii. 



40. Psmammobia. 

 a. b. the two hinges* 



11. Psammolea serotina. 

 a. the opposite hinge. 



42. Mya. 

 a. the opposite hinge. 



13. Anatina truncata. 



M ACTR ACEJE. CONCILE. 



Fig. 14. Lutraria rugosa. 



45. Mactra. 



fi. b. the two hinges. 



16. Crassatella nonacina. 



17. Solenimya australis. 



18. Amphidesma variegata. 



Fig. 19. Ungulina transversa. 



a. inner view of the opposite 

 valve. 



20. Erycine cardioides. 



21. Galatea radiata. 

 a. b. the two hinges. 



* All the figures not marked with an asterisk, which amount to four-fifths of the 

 whole, are original drawings from the objects themselves. 



