PLATE VIII. 



PAGE 



Fig. 1. Rhvkchonella gnathopiiora. 39 



Dorsal view. 



1 a. Ventral view of same. 



1 b. Anterior view of same. 



1 c. Profile of same. 



1 (/. Dorsal view of a wider, more compressed specimen. 



1 e. Front view of same. 



1 /. Front view of a gibbous specimen. 



Fig. 2. Terebratvla 1 41 



2 a. ~ Dorsal view of same, with beak broken. 



a 



2 I). Profile of same. 



Fig. 3. Pecten acutiplicatus. 46 



A mould or impression left in the matrix, by apparently 

 a left valve. The shell is not entirely dissolved out, 

 but fills the portions of the mould. 



Fig. 4. Gryph^a ? 42 



View of the under side of the lower valve of a small 



specimen. 



4 a. View of the upper side of an upper valve, as seen in the 



matrix, showing also a little of the beak of the lower 

 valve. The left margin of both valves imperfect. 



Fig. 5. ASTARTE VENTRICOSA. 50 



View of left valve, being from a plaster cast, taken from 

 a mould left in the matrix. 



5 a. An ideal section of the entire shell, to show its convexity. 



Fig. 6. Myacites depressus. 51 



View of left valve, broken a little in front. 



6 a. Dorsal view of same. 



Fig. 7. Tkiuonia pandicosta. 48 



View of a right valve imbedded in the matrix (outline 



may not be exactly correct). 



Fig. 8. Unicarbium ? gibbonum. 50 



Posterior view. 



8 a. View of right valve. 



Fig. 9. Belemxites — '.' 53 



A longitudinal section of the upper extremity, showing 

 the alveolar cavity filled with the stony matrix. 



9 a. A transverse section of the same at the extremity of the cavity. 



