PLATE XXIX. 



Trematopygus crucifer (Morton) (p. 71). 



Acad. Nat. Sci. Philadelphia 1464, type. 



Figure la. Posterior surface of the test. 



lb. Lower portion of the petaloidal region of the right posterolateral ambulacrum, X 5. 



lc. Several plates of the same, X 10. 



Id. Apical system, X 5. 



le. Tubercle from above, X 20. 



If. Lateral view of the same, X 20. 



Catopygus oviformis Conrad (p. 72). 



Acad. Nat. Sci. Philadelphia 1477, 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. Portion of right posterolateral ambulacrum, X 3. 



2f . Several plates of the same, X 10. 



Catopygus pusillus Clark (p. 73). 



U. S. Nat. Mus. 2210, type. 



Figure 3a. Upper surface of the test. 

 3b. Lower surface of the test. 

 3c. Lateral surface of the test. 

 3d. Posterior surface of the test. 



Catopygus williamsi Clark (p. 73). 

 Johns Hopkins Univ. T 3010, type. 



Figure 4a. Upper surface of the test. 

 4b. Lower surface of the test. 

 4c. Lateral surface of the test. 

 4d. Posterior surface of the test. 

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