EXPLANATION OF PLATE IX. 



Fig. 



30. Bklkmnites pollex. 



I . Sketch of a specimen in the Whitby Museum. Lateral view, 

 r'. Lower portion of the same, to show a broad irregular depression, and two 

 stigmata. 



/". Smaller specimen, in the Collection of Prof. Pliillips. Lateral view. 



21. BtLEMMTXS ACUMINATIS (FERRECS). 



/. Side view of a specimen in the Whitby Museum. 



Transverse section, to show the nearly cucular outhne. 



23. Bllemnites aclminatus. 



/. Side view of a specimen in the Whitby Museum. 



(J. Dorsal aspect, near the apex. 



*. Cross section,, to show the nearly circular outline. 



