26 



(Echinoderins.) 



•i 20. A Cystidean. In drift at Alfred 

 i2i. Crinoid stems and calyx, small. 



122. Transverse sections of larger crinoid stems. Very common 

 locally in Portage and Chemung rocks. 



123. Fcne stella sp. 



(Bryozoa.) 



(Fossil bivalve supposed to be related to fresh-water forms.) 



124. Amnigenia caiskillensis. Common locally eastward in 

 Oneonta and Catskill rocks. 



As a rule, the figures which follow are somewhat less than 

 life size; especially is this true of the Cephalopocls. Size, howev- 

 er, differs with different individuals and cannot be regarded as of 

 great importance in determining specimens. 



