EXPLANATION OF PLATE V. 



Fig. 



IL Belemnites Gingensis (Oolite). 



V. Ventral aspect of a specimen from the lower part of the InferiorOolite of Dundry . 



/. Lateral aspect. 



s. Longitudinal section. 



/. Flanges of the phragmocone. 



2'. Siphuncle crossing the septa. 



2". Same, enlarged. 



12. Belemnites insculptus (Oolite). 



/',/". Lateral views of two specimens from the lower part of the Inferior Oolite of 

 Dundry. 

 V. The ventral aspect, 

 s. Longitudinal section. 

 s'. Transverse section across the alveolar cavity. 



13. Belemnite from the Lias, allied to B. insculptus. 



d. Dorsal aspect of a specimen from the Lias of Lyme Regis. 



/'. Lateral view of the same. 



I". Lateral view of a different specimen, with a very short axis to the guard. 



a. View of the end, to show the two distinct grooves. 



14. Belemnites latisulcatus. 



/. Lateral view. 



V. Ventral aspect. 



s. Section across the guard, through the alveolar cavity. 



