198 QUESTIONS ON BIVALVES. 



19. What is the generic character of the 

 Spondylus ? 



20. What is the generic character of the 

 Chama, and its distinguishing mark ? 



21. Give an account of the Chama Gigas ? 



22. What is the generic character of the Area, 

 and its distinguishing mark ? 



23. What difference occurs in the arrange- 

 ment of the teeth of the Area ? 



24. What is the generic character of the 

 Ostrea, and its distinguishing mark ? 



25. Describe the two great families into 

 which the Ostrea is divided. 



26. Describe the difference in the habits of 

 the Pecten and the Oyster. 



27. Describe the manner of taking and fat- 

 tening the common oyster. 



28. What is the generic character of the 

 Anomia ? 



29. Describe the two families into which the 

 Anomia is divided. 



30. What is the generic character of the 

 Mytilus ? 



31. Describe the habits of the common mus- 

 cle. 



32. Describe the pearl fishery. 



33. What is the generic character of the 

 Pinna ? 



34. Why is the Pinna considered as a link 

 between the univalves and bivalves ? 



35. Describe the habits of the animal inha- 

 biting the Pinna. 



