PLATE XXXI. 



Cassidulus micrococcus Gabb (p. 76). 



Acad. Nat. Sci. Philadelphia 1480, type. 



Figure la. Upper surface of the test, 

 lb. Lower surface of the test. 

 1c. Lateral surface of the test. 

 Id. Posterior surface of the test. 



le. Anterior ambulacrum at the base of the petaloidal region, X 2. 

 ] f . Several plates in petaloidal region of the anterior ambulacrum, X 8. 

 lg. Oral portion of an ambulacrum, X 8. 

 Ih. Apical system, X 5. 

 li. Surface of an interambulacral plate, X 20. 



Cassidulus subquadratus Conrad (p. 77). 



TJ. S. Nat. Mus. 31200. 

 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. Lower portion of the petaloidal region of the right anterolateral ambulacrum, X 2. 

 2f . Oral portion of an ambulacrum, X 5. 

 2g. Apical system, X 8. 

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