PLATE XXX. 



Cassidulus elorealis (Morton) (p. 74). 

 Acad. Nat. Sci. Philadelphia 1495, type. 



Figure la. Upper surface of the test, 

 lb. Lower surface of the test, 

 lc. Lateral surface of the test. 

 Id. Posterior surface of the test, 

 le. Right posterolateral ambulacrum, X 3. 

 If. Several plates in the petaloidal region of the same, X 8. 

 lg. Same, lower surface, X 8. 

 lh. Posterior interambulacrum, X 2. 

 li. Single plate, X 4. 

 lj. Apical system, X 5. 

 Ik. Tubercle from above, X 20. 

 11. Lateral view of the same, X 20. 



Cassidulus ^quoreus Morton (p. 75). 



Acad. Nat. Sci. Philadelphia 1475, type. 



Figure 2a. Upper surface of the test. 

 2b. Lower surface of the test. 

 2c. Lateral surface of the test. 

 2d. Posterior surface of the test. 

 2e. Anterior ambulacrum, X 2. 

 2f . Several plates, petaloidal region of the same, X 8. 

 2g. Same, oral region, X 8. 

 2h. Apical system, X 5. 

 2i. Diagram showing the arrangement of the plates about the peristomial opening, X 



