EXPLANATION OF PLATE IX. 

 (All figures after Clark.) 



PSEUDODIADEMA DIATRETUM (Morton), . . . p. 285 



1-2. Ventral and lateral views of a complete individual, (Figure 



i enlarged). 



3. Two interambulacral plates, (x4). 

 4-5. Portions of the ambulacral area highly magnified. 

 6. Tubercle, much enlarged. 



Vincentown Hmesand; Vincentown. 



PSEUDODIADEMA SPECIOSUM Clark, p. 286 



7-8. Dorsal and lateral views of a complete individual. 

 9. Upper portion of an interambulacral area, enlarged. 

 10. Three interambulacral plates, highly magnified. 

 11-12. Portions of the ambulacral area, highly magnified. 



13. Tubercle of ambulacral area. 



14. Tubercle of interambulacral area. 



Vincentown Hmesand; Vincentown. 



