PLATE XIV. 



Fig. 



1. Rhynchonella Wrightii, nat. size. 



2. „ furcillata. Var., with two plaits on the mesial fold. 



3. „ „ Var., with three plaits 



4. „ „ Var., with four plaits „ 



5". „ „ Var., with five plaits „ enlarged. 



6. ,, riinosa, nat. size. 

 6 ahc . ,, ,, enlarged. 



7. „ oolitica, nat. size. 

 l cd . ,, ,, enlarged. 



8. 9. „ acuta, nat. size. 



10. „ cynocephala. Var., with only one plait on the mesial form. This 



case is very rare in this species. 



11. „ ,, The common state or type, two plaits on the mesial 



fold. 



12. ,, ,, Another rare variety, with three plaits on the mesial 



fold. 



13. 14. ,, ringens. Two specimens, nat. size. 



15. ,, ,, A French specimen, type of the species placed here for 



comparison. 



16. „ ,, Another French specimen, figured, to show that some- 



times the form varies from the original type, having 

 in this most exceptional case three plaits on the 

 mesial fold. 



17. ,, sub-ringens, nat. size. 



17 aic . „ ,, enlarged figures. 



