EXPLANATIONS OF PLATE V. 



PAGE 



Fig. 1. 0, b, c, d, e,f, g, h, i. Belemnites densus. ... . . 126 



1 a. A slender specimen split longitudinally, so as to show the conical alveolar cavity, filled with 

 stony matrix, showing on its surface marks of the position of the septa. 

 . 1 b. Another specimen sliowing the exterior, and a portion of the cavity. 



. 1 c. Part of another slender specimen below the cavity, split longitudinally, so as to show the nearly 

 central position of the axial line in these smaller individuals. 

 1 d. Part of a larger specimen (below the cavity) showing a faint furrow near the lower extremity 

 on the ventral side. 



1 f. A similar fragment, showing near the apex a small ridge or obscure carina, on the dorsal side. 



• \f. Fragment of upper part of a large specimen, showing a cast of the phragmocone filling the 



cavity. 

 r \ g. Transverse section of a large specimen below the middle of the cavity. 

 , 1 h. An extremity of a small specimen with a distinct ventral furrow, and a very eccentric axial 



line. (May be another species.) 

 • 1 i. Transverse section of same. 



Fig. 2. o, h, c, d, e. Ammonites cordiformis 122 



2 a. Side view of a cast consisting of about half a whorl. 

 2 b. Profile view of same. 



2 c. An enlarged septum of the same. 



2 rf. Side view of a young individual, showing its more sharply defined costse. 



2 e. Profile of same, showing its crenate dorsal keel. 



'Fig. 3. a, 6. . . YiviPARUs GiLLi 115 



■3 a. View of aperture ; specimen somewhat worn. 

 3 6. Opposite side same. 



Hg. 4 SuiPULA ? 128 



