PLATE XIII. 



PsEUDODiADEMA DiATRETUM (Morton) (page 46). 



Fig. la. Under surface of t^st. 



16. Latifial view of the same. 



Ic. Two iuterambnlacral plati's, magnified four diameters. 



Id. Ambulacral plates, highly maguitied. 



le. Ditto. 



1/. Tubercle, much enlarged. 



PsKUDODiADEMA TEXANUM (Roemer) (page 47). 



Fig. 2a. Upper portion of the interambulacral area, highly magnified. 

 2b. Portion of ambulacral area, ditto. 

 130 



