PLATE XXXVIII. 



Holaster simplex Shumard (p. 85). 

 U. S. Nat. Mua. 8382, figured specimen A. 



Figure la. Lateral surface of the test. 



lb. Lateral surface of the test restored. 



lc. Posterior surface of the test. 



Id. Portion of the ambulacrum, X 3. 



le. Portion of the ambulacrum, X 3. 



If. Tubercle, X 10. 



lg. Tubercle, X 10. 



lh. Interambulacral plate, X 3. 



li. Right anterolateral ambulacrum, X 



lj. Apical system, X 3. 



