PLATE LXI. 



MOETONELLA QUINQUEFARIA (Say) (p. 12S 

 Amherst College, specimen B. 



Figure la. Upper surface of the test, 

 lb . Lateral surface of the test. 



Peeiarchus lyelli Conrad (p. 131). 

 Boston Soc. Nat. Hist. 1553, specimen A. 



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. Part of one of the ambulacra, X 

 2f. Apical system, X 4. 

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