PLATE XX. 



Cottaldia eotula Clark, II. sp. (p. 57). 



Johns Hopkins Univ. T 3007, type. 



Figure la. Side of test of large specimen, 

 lb. Side of test of small specimen, 

 lc. Portion of ambulacrum, X 10. 

 Id. Portion of interambulacrum, X 10. 



Diplopodia taffi Cragin (p. 58). 



Geol. Survey Texas, type. 



Figure 2a. Upper surface of the test. 

 2b. Lower surface of the test. 

 2c. Lateral surface of the test. 

 2d. Portion of ambulacrum, X 5. 

 2e. Portion of interambulacrum, X 5. 



Diplopodia steeeruvitzi Cragin (p. 58). 



Geol. Survey Texas, type. 



Figure 3a. Upper surface of the test. 

 3b. Portion of ambulacra, X 8. 

 3c. Portion of interambulacrum, X 8. 



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