PLATE XXXIX. 



Holaster simplex Shumard (p. 85). 

 Geol. Survey Texas, figured specimen B. 



Figure la. Upper surface of the test, 

 lb. Lower surface of the test, 

 lc. Lateral surface of the test. 

 Id. Anterior surface of the test, 

 le. Apical system, X 4. 

 If. Portion of ambulacrum, X 10. 

 lg. Three interambulacral plates, X 5. 



Enallaster texanus (Roemer) (p. 86). 



U. S. Nat. Mus. 9857. 

 Figure 2a. Upper view of the test. 

 2b. Lower view of the test. 

 2c. Posterior view of the test. 

 2d. Posterior view of the test. 



2e. Portion of the petaloidal region of the right anterolateral ambulacrum, X 10. 

 2f. Portion of the anterior ambulacrum, X 10. 

 2g. Apical system, X 6. 

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