PLATE XXXIII. 



Cassidulus porrectus Clark (p. 78). 

 U. S. Nat. Mus. 21890, type. 



Figure la. Posterior surface of the test, 

 lb. Lower surface of the test, 

 lc. Lateral surface of the test. 

 Id. Lower portion of petaloidal region, X 5. 

 le. Central portion of the same, X 5. 

 If. Three interambulacral plates, X 2. 



Cassidulus stantont Clark (p. 79). 

 IT. S. Nat. Mus. 20260, type. 



Figure 2a. Upper surface of the test, X 2. 

 2b. Lower surface of the test, X 2. 

 2c. Lateral surface of the test, X 2. 

 2d. Posterior surface of the test, X 2. 

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