PLATE II. 



1-15. Dorocidaris Blakei A. Ao. 



Fi". 1. Portion of test seen in profile, facing the median interambulacral line, from a specimen 37 mm. 

 in diameter. 

 Abactinal system ol 

 i :;. 4. Primary elongate radioles, similar to those of D. papillata. 

 Pi;, r . 5. Primary radiole, somewhat flattened at extremity. 



Fig. 6, 7. Primary radioles somewhat flattened and slightly fan-shaped at extremity. 

 Fig. 8-10. Primary radioles still more fan-shaped than these of the preceding figures. 

 Fig. 11-13. Small interambulacral radioles of the actinal side near actinostome. 

 Fig. 14, 15. Larger and stouter rad ' tinal .ride near the ambitus. 



L6-27. Dorocidaris Bartletti V. &.G 



Fig. 16. Portion of test seen in profile, showing the ambulaoral area and a few primary plates of the 

 interambulacral area, adjoining the apical system, from a specimen 50 mm. in diameter. 



Fig. 17. Abactinal system of same. 



Fig. 1S-27. Different primary radioles taken from a single specimen, showing the more or less serrated 

 structure between tin- two extremes of Fig. 23 and 27. 



