142 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? 



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 genera seem to connect the shells 

 with spires, and those without ? 



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 resemblance and 

 also in what respect they differ. 



12. In what respect do the shells of warm cli- 

 mates 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 ? v 



16. What is the generic character of the Cy- 

 prsea, and what its most distinguishing mark ? 



17. What is there remarkable in the manner 



