PLATE XXVI. 



Holectyptjs PLANATUS Roemer (p. 65). 

 Geol. Survey Texas, figured specimen C. 



Figure la. Upper surface of the test. 

 lb. Lower surface of the test, 

 lc. Apical system, X 5. 

 Id. Portion of ambulacrum, X 3. 

 le. Portion of interambulacrum, X 3. 



