PLATE X. 



Leiocidaris hemigranostis (Shumard) (p. 48). 



Figure la. Upper surface of the test, X }• 

 lb. Lower surface of the test, X f. 

 lc. Lateral surface of the test, X i- 

 Id. Interambulacral plate, 

 le. Portion of ambulacrum, X 5. 

 If. Tubercles, X 2. 

 lg. Apical system. 



U. S. Nat. Mus. 21768. 



