EXPLANATION OF PLATE IIL 



Fig. 



7. Belemnites clavatus. 



/'. Lateral view of a young specimen. I now possess much smaller specimens. 



/". Lateral view of a slender elongate individual. 



/'". Lateral view of a specimen which shows the furrow distinctly- 



I". Lateral view of a more claviform varietv. 



r . Frustum, showing the grooves. 



/". Fusiform variety. 



/"'. Larger individual, indicating that still larger examples should be looked 



for, showing less of the retral swelling, 

 s, s. Longitudinal sections. One shows the phragmocone in connection with 



the guard. 

 s'— s'. Transverse sections at several points ; the crossing the alveolar cavity, 



the last near the apex of the guard. 



8. Belemnites compressus. 



/'. Lateral view. At the central point between d and v is the apex of the 



alveolar cavity. 

 /". A large individual. 

 /'". Specimen very blunt at the end. 

 P\ Malformation. 

 d. Dorsal view. 

 v . Ventral view of specimen /', showing a short ventral groove in the alveolar 



region. 

 v" . Ventral aspect of specimen /". 

 s. Longitudinal section, to show the central alveolar cavity and axis of the 



guard, 

 s'. Section across the alveolar cavity. 

 s". Section across the guard. 

 s'". Worn and umbilicated end of a specimen. 



