PLATE IV. 



SoLASTER MoRETONis, Forbes. 

 From the Great Oolite. 



1 a. SoLASTER MoRETONis, Forb., p. 104. Ventral surface, natural size. 



b. Ambulacral ossicles, magnified. 



c. An ambulacral bone, with inter-ambulacral ossicula supporting their combs of long 



hair-like spines, magnified. 



d. Inner or proximal portion on an ambulacrum with its large angle ossicula and spines, 



magnified. 



e. Retiform arrangement of the ossicula forming the framework of the disc, magnified. 



