252 



PAL/EONTOLOGY 



I Br{" 



FIG. 71. CRINOIDEA. 



IB, Infrabasals ; B, basals ; /?, radials ; Ax, axillary, a, Pisocrinus, 

 dissected. (After Bather.) a. Anterior; p, posterior; /, left ; r, right ; 

 .A", radianal ; x, anal. *, Platycrinus Iccvis Miller, Lower Carbon- 

 iferous. Cup only. (After de Koninck.) A. P., Arm-facet, c, Crota- 

 locrinus rugosus (Miller), Silurian (Wenlock Limestone). Cup only. 



