PLATE LXII. 



MiCRASTER COR-ANGUINUM, Kleitl. 



From the Upper Chalk. 



Fig. 1 a. Test, upper surface, natural size. My collection. 



h. Do. under do. do. 



c. Do. lateral view do. 



d. Do. posterior do. do. 



e. Do. anterior do. do. 



/. Ambulacral and inter-arabulacral plates, magnified three times. 



(J. Apical disc, highly magnified. 



h. Lateral ambulacra, magnified four diameters. 



i. Anterior single ambulacrum, magnified four diameters. 



k. Structure of the sub-anal fasciole, magnified. 



/. Structure of tubercles, bosses, and granules, magnified. 

 Kg. 3. Portion of a spine adherent to the test do. 



Pig. 4. Do. do. do. do. 



Fig. 5. Spine found on the test do. 



