EXPLANATION OF PLATE XVIII 



Fig. 



46. Belemnites inornatus, n. s. [Without ventral groove.] Blue Wick, Robin Hood's 

 Bay. 



/'. Lateral view, showing the insertion of the phragmocone. Between d and v 

 is the alveolar apex. 



/". Lateral view of a specimen in which the grooves and striae are very obscure 

 (worn). 



s. Longitudinal section, showing the slightly arched phragmocone, covered by 



the conotheca, in situ, 

 ■s. Transverse section across the alveolar cavity. 

 s" . „ „ at the alveolar apex. 



tp'. Portion of the conotheca, seen dorsally. 

 ((,". Portion of the same, seen laterally. 



