EXPLANATION OF THE PLATES AND WOOD-CUTS. 



Fig. 3. Belemnites ? A nearly cylindrical fragment without a sulcus. Very 



like B. elongatus of Miller. 



Loc. near Charee. 

 Fig. 4. Nautilus hexagonus (M. C, t. 529) ? Flatted spheroidal, with a very small um- 

 biHcus ; front approaching to flat; sides rather conical; septa 15 in a whorl; 

 aperture wider than long ; siphuncle unknown. Diameter 3^ inches, thickness 2\ 

 inches, length of the aperture Ij inch. 



This differs from N. hexagonus in having a smaller umbilicus and in being more 

 rounded. It wants the line that occurs in the middle of the front of iV. lineatus, 

 which it nearly resembles. The figure is reduced to half the natural size. 



Loc. near Charee. 

 Fig. 5. Ammonites Herveyi, (M. C. t. 195, Zieten, 19. t. xiv. p. 3.) var. 



This differs from the English specimens only in having a wider umbilicus. It 

 agrees well with Zieten's figure, which differs a little from the English specimens, 

 to which A. macrocephalus, figured by the same author at Tab. 5. f. 1 and 4., ap- 

 proaches nearer. The figure is reduced one half. 



Loc. near Charee. 

 Fig, 6. Ammonites elephantinus. Approaching to globose, with a very wide umbilicus 

 exposing the inner whorls ; whorls obtusely angular at their sides, crossed by very 

 prominent rounded costae, which divide into two as they pass over the front; 

 aperture transversely elongated, gently arched. Diameter 4 inches, thickness 2| 

 inches, length of aperture above an inch. The figure is reduced to half the 

 natural size. 



Loc. near Charee. 

 Fig. 7. Ammonites formosus. Discoid, with a rounded edge, umbilicate, radiated; 

 umbilicus narrow, acutely conical ; radii numerous, shghtly elevated, obscure near 

 the umbilicus, often forked near their commencement, passing in a direct course 

 over the front; aperture sagittate, with truncated angles. Diameter 5 inches, 

 thickness 2\ inches, length of aperture \\ inch. This is reduced in the figure to 

 lialf its size. 



Loc. near Charee. 

 Fig. 8. Ammonites lamellosus. Discoid, thick, with a rounded margin umbilicate, 

 radiated ; umbilicus narrow, exposing a small portion of each inner whorl, smooth ; 

 radii numerous, elevated into obtuse lamellae, commencing with a curve upon the 

 edge of the umbihcus, often forked upon the middle of the sides, bent forward as 

 they pass over the margin. Diameter 4 inches, thickness If inch. The figure is 

 reduced one half. 



Loc. near Charee. 

 Fig. 9. Ammonites Opis . . . Discoid, compressed, with an obtuse edge, radiated ; 

 inner whorls one-third exposed ; whorls shghtly convex on their sides, their inner 

 edge rounded ; radii commencing with a curve at the inner edge of the whorls, 

 numerous, prominent, rounded, often forked near the middle, slightly bent forward 

 as they pass over the front ; aperture elhptical. Diameter 4| inches, thickness \\ 

 inch, length of aperture 1^ inch. This figure is also reduced one half. 



Loc. near Charee. 



