140 UNIVALVES. 



QUESTIONS ON THE UNIVALVE 

 SHELLS. 



1. What are the parts of an univalve shell ? 



2. Give a description of each part, with the 

 derivation of the terms. 



3. How is the generic character of univalve 

 shells determined 1 



4. How is the specific character of univalve 

 shells determined ? 



5. Give a list of the genera of univalve shells? 



6. Name those which have regular spires. 



7. Name those without spires. 



8. Which shells seem to connect the shells 

 with spires, and those without 1 



9. What shells have longitudinal apertures ? 



10. Which shells are canaliculated, and which 

 entire ? 



11. Which of the univalve shells resemble 

 each other? Describe their points of resem- 

 blance, and also in what respect they differ. 



12. In what respect do the shells of warm 

 climates differ from those of colder regions ? 



13. What is the generic character of the 

 Cone ? and what its distinguishing mark? 



14. What remarkable instinct is exhibited by 

 the animal of the Cone ? 



15. Where are Cones found? 



16. What is the generic character of the Cy- 

 praea, and what its most distinguishing mark ? 



17. What is there remarkable in the manner 



