18 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Nov. 5, 



Plate III. 



Fig. 1. Bellerophon decipiens, De Kon., natural size, seen from the side of the 

 back. 



1 a. The same, seen in profile. 



2. Bellerophon Jonesianus, De Kon., natural size, seen in profile. 



2 a. Another specimen, natural size, seen in front, and showing the ribs 



with which the species was ornamented when young. 



3. Bellerophon orientalis, De Kon., natural size, seen from the dorsal side. 



4. Macrochcilus avellanoides, De Kon., natural size. 



5. Ceratites Hauerianus, De Kon., natural size, seen in profile. 

 5 a. The same, seen from the side of the mouth. 



Plate IV. 



Fig. 1. Cidaris Forbesiana, De Kon., complete spine, natural size. 



2. Fragment of a spine of the same species, showing a variety with well- 



marked granules, natural size. 

 2 a. Transverse section of the same. 



3. Solenopsis imbricata, De Kon., natural size. 



4. Pecten Flemingianus, De Kon., twice the natural size. 



4 a. Line indicating the natural size. 



5. Pecten crebristria, De Kon., natural size. 



5 a. The same enlarged, twice the natural size. 



6. Pecten Asiaticus, De Kon., natural size. 



7. 8, 9. Anomia Lawrenciana, Fleming. 



7. Specimen of the natural size, seen in profile. 

 7 a. Another specimen, natural size ; upper side. 

 7 b. The same, showing the lower valve. 



8. The same, seen in profile. 



9. Another specimen of the natural size, seen in profile. 



10. 11, 12. Dentalium Hercideum, DeKon. 



10. Specimen of the natural size. 

 10 a. Upper opening of the same. 



11. Another specimen of the natural size, divided in two in the direction of 



the length, so as to show the thickness of the shell and the shape of the 

 cavity. 



12. Third specimen, natural size. 



12 a. Upper opening, furnished with a tooth or internal keel. 



Plate V. 



Fig. 1. Ceratites planulattis, De Kon., natural size, seen in profile. 

 1 a. The same, seen from the side of the mouth. 

 1 b. Lobes of the same. 

 1 c. Another young specimen, seen in front. 

 1 d. The same, seen in profile. 



1 e. Lobes of the same. 



2. Goniatites ? Gangeticus, De Kon., natural size, seen in profile. 



2 a. The same, seen in front. 

 2b. Lobes of the same. 



Plate VI. 



Fig. 1. Ceratites Lyellianus,De'Kori., natural size, seen in profile. 



2. Ceratites David sonianus, De Kon., adult specimen of the natural size, 



seen in profile. 

 2 a. Lobes of the same. 



3. Ceratites Lawrencianus, DeKon., natural size, seen in profile. 



4. Ceratites Buchianus, De Kon., natural size, seen in profile. 

 4 a. Lobes of the same. 



