EXPLANATIONS OF PLATE V. 



PAGE 



Fig. 1. a, 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 6. Another specimen showing 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 farrow near the lower extremity 



on the ventral side. 



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

 If. Fragment of upper part of a large specimen, showing a cast of the phragmocone filling the 



cavity. 

 1 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 1. Transverse section of same. 



Fig. 2. a, b, c, d, e. . . . AMMONITES CORDIFOEMIS. . .... 122 



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

 2 6. Profile view of same. 



2 c. An enlarged septum of the same. 



2 d. 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, b VIVIPARUS GILLI. . .... 115 



3 a. View of aperture ; specimen somewhat worn. 

 3 6. Opposite side same. 



Fig. 4 SuiPULA ? 128 



