EXPLANATION OF PLATE VIL 



Fig. 



17. Belemnites elongatus. 



/. Lateral view (right side) of the specimen in the British Museum {d — v, the 

 place of the apex of phragmocone. 



r. The opposite side of the same towards the point. (This figure is accidentally 

 reversed, so as to appear to be the right side.) 



V. Ventral aspect of retral part of guard. 



d. Dorsal aspect of the same. 



s. View of a septal plate, showing the siphuncle at v. 



s". Transverse section near the apex. 



s"' . Transverse section still nearer to the apex. 



a. End view of the apex of guard. 



