EXPLANATION OF PLATE CIX. 



Belemnitem.a AMERICANA ( ALirtoii ) p. S39 



1. X'entral \ic\v of a large individual showing the slit. 



2. Another \'iL'\v of the same indi\'idual with a seetiin removed 



to show the alveolar cavity. 

 ,V \"k'w of a smaller in<lividiial preserxiiTg the nitierijnat:- ex- 

 tremity-. 



.\afcsiiiL' marl: IlolmJcl. 



4. \'iew of a cast of the alveolar cavity. 



Xavcsink marl: Atlanlic Highlands. (loS). 



Baci'Eites nv,\Tus Say p. 821 



5. Laleral view of an internal cast. 



Xaz'csink marl; .illaiitic Highlands, iioS). 



Eacut.iTes aster Morlrm ? p. 823 



6-7. Two \'ie\\s of a specinieii identified ;ind illnstr.atcd hy Whit- 

 field. 



Navcsii.h :i:a:l: llohr.dcl. 



II02 



