DEVONIAN ERA. 



also continued as families throughout this era. Of the latter 

 we have a new species (brontes) supposed to have been not 

 less than four feet long, and marked by several original features. 



FIG. 17. 



FIG. 18. 



FIG. 19. 



Devonian Brachiopods. 



Fig. 18, Calceola sandalina; Fig. 19, Productus 



aculeatus. 



Brontes fldbellifer. 



Some of the new brachiopods are of a very peculiar shape (cal- 

 ceola and productus] ; amongst the gasteropods are some which 

 approach existing forms. The lordly cephalopoda continue to 

 be largely represented, but in a considerable change of form ; 



for while the chief animals of 

 2 - this class in the Silurians (ortho- 



ceratites) had a simple, straight, 

 or slightly curved shell (Fig. 

 14), those new to the present 

 era (as clymenia) had one form- 

 ing a complete spiral. 



The most remarkable circum- 

 stance connected with the De- 

 vonian formation, is its pre- 

 senting us with an abundance 

 of fish. A few faint traces of 

 this class had, as we have seen, 

 been presented at a late point 

 in the Silurian formation. We 

 _ are now to see such memorials 



Clymenia SedgwicUi. of them in the Devonian forma- 



