PLATE XXXI 



PAGK 



Figs. 1-5. CAMAROCRINUS STELLATUS Hall 227 



1-3. Three transverse cuts through the same bulb; the letters indicate 

 the same wall in the different sections; M, the medio-basal 

 chamber. X %. 



4. Another specimen cut through the center longitudinally; M, medio- 



basal chamber. X %. 



5. A second bulb cut through the center longitudinally. X %. 



Helderberg formation, Keyser member, Keyser, W. Va. 



