PLATE XVI. 



DiPLOPODiA TEXANUM (Roemer) (page 48). 



Fig. la. Lower portion of ambiilacral area, highly magnified. 

 lb. Upper portion of intei-ambulacral area, much enlarged. 

 Ic. Lower portion of same, ditto. 

 Id. Tubercle. 



DiPLOPODiA HiLLi Clark (page 50). 



Fig. 2a. Upper surface of the te.st. 

 2/). Lower surface of the ,same. 

 2c. Lateral surface of the same. 

 2d. Upper portion of an ambulacral area, enlarged. 

 2e. Three plates of the same, highly magnified. 

 2/. A portion of an interambulacral area, highly magnified. 

 2g. Tubercle. 

 136 



