252 



PAL/EONTOLOGY 



O- 



^[^^fer-i 



V UAytV/ - 1 

 a O O 



rp r.a. I. a. 



FIG. 71. CRINOIDEA. 



IB, Infrabasals; B, basals ; R, radials ; Ax, axillary, a, Pisocrinus, 

 dissected. (After Either.) a, Anterior ; />, posterior ; /, left ; r, right ; 

 R , radianal ; x t anal, b, Platycrinus Icevis Miller, Lower Carbon- 

 ifero^. Cup only. (After de Koninck.) A.F., Arm -facet, c, Crota- 

 locrmts ruifosus (Miller), Silurian (Wenlock Limestone). Cup only. 



