PLATE II. 
1-15. Dorocidaris Blakei A. Ag. 
Fig. 1. Portion of test seen in proiile, facing the median interambulacral line, from a specimen 37 mm. 
in diameter. 
Fig. 2. Abactinal .system of same. 
Fig. 3, 4. Primary elongate radicles, similar to those of D. papillata. 
Fig. 5. Primary radiole, somewhat flattened at extremity. 
Fig. 6, 7. Primary radicles somewhat flattened and slightly fan-shaped at extremity. 
Fig. 8-10. Primary radicles still more fan-shaped than those of the preceding figures. 
Fig. 11-13. Small interambulacral radicles of the actinal side near actinostome. 
Fig. 14, 15. Larger and stouter radicles of the actinal side near the ambitus. 
16-27. Dorocidaris Bartletti A. Ag. 
Fig. 16. Portion of test seen in profile, showing the ambulacral 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. 18-27. Different primary radicles taken from a single specimen, showing the more or less serrated 
structure between the two extremes of Fig. 23 and 27. 
