PLATE LXIII. 



Periarchus pileus-sinensis Ravenel (p. 135). 

 U. S. Nat. Mus. 5133, specimen A. 



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. Part of one ambulacrum, X 



Periarchus pileus-sinensis Ravenel (p. 135). 

 U. S. Nat. Mus. 137791, specimen B. 



Figure 2a. Upper surface of the test. 

 2b. Lower surface of the test. 

 2c. Posterior surface of the test. 

 2d. Lateral surface of the test. 

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