PLATE XI. 



Saxenia tumidula Clark (page 41). 



Fig. la. Upper surface of test, magnified two diameters. 



lb. Under surface of the same. 



Ic. Lateral surface of the same. 



Id. Interambulacral area, magnified four diameters, 



le. Single plate of same, highly magnified. 



If. Ambulacral area, highly magnified. 



Ig. Apical disk, enlarged. 



Ih. Genital plate of same, highly magnified. 



It. Mouth opening, enlarged. 



1;. Tubercle, enlarged. » 



Salenia bellula Clark (page 43). 



Fig. 2a. Upper surfiice of test, magnified two diameters. 

 2b. Under surface of the same. 

 2c. Lateral surface of the same. 

 2d. Three interambulacral plates, highly magnified. 

 2e. Three ambulacral plates, highly magnified. 

 2/. Apical disk, enlarged. 

 2g. Tubercle, highly magnified, 

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