MOLLUSCOIDEA — BRACHIOPODS 205 



1. Define each of the classes into which the Molluscoidea are 

 divided, giving a recent and fossil example of each where possible. 



2. Which class has the best-known fossil representatives? 



3. What do Bryozoa and Brachiopoda possess in common 

 that they should be placed in the same phylum ? 



4. Do these two classes enter into direct competition as 

 regards food getting ? 



5. How do the Molluscoidea differ from the Ccelenterata in 

 the following characters : (a) habitat, (b) protecting and sup- 

 porting skeleton, (c) locomotion, (d) food, {e) its capture, (/) its 

 intake, (g) digestion, (h) blood circulation, (i) excretion of waste, 

 (j) respiration, (k) nervous system, (/) sense organs, (m) repro- 

 duction, (n) geologic range ? 



6. How do the Molluscoidea differ from the Annulata in the 

 characters given under question 5 above ? 



