214 NOVA SCOTTAN GEOLOGY. — HONEYMAN. 



Pteropoda. 



Conularia. 

 W. B., E. River. Cephalopoda. 



Orthoceras. 



Pisces, 



Cochliodus sp. Salter. 

 In my London Exhibition collection, Mr. Salter recognized two 

 teeth of Cochliodas. I was puzzled to know what they were- 

 He at the same time detected specimens of Bellevophon decus- 

 satus. I believe this is the first recognition of Fishes of so early 

 date in Nova Scotia, and the first identification of Bellerophon 

 in the Lower Carboniferous Limestone. 



The Silurian Fauna have totally disappeared. As far as Nova 

 Scotia is concerned, this is no great marvel, when we consider 

 the character of the agencies that were at work during the lapse 

 of the Devonian Period, and their stupendous operations. Thus 

 and then Nova Scotia became largely subserial, had its form well 

 defined, and its mountain systems established. Its coasts 

 presented to the seas of the Lower Carboniferous period rock 

 arrangements to a large extent corresponding with those now 

 existing. Hence we have the carboniferous rocks directly on 

 Archaean, Cambrian and Silurian systems, just as the marine 

 accumulations of shingle, sand, clay, dead shells, and their debris 

 now rest, or are in process of formation. We should take this into 

 account, as explanatory of rock arrangements which are readily 

 by some referred to fault occurrence. Faults there are of course, 

 and enough of them, without an unnecessary multiplying of their 

 number. 



The conditions of the Carboniferous Period were greatly dif- 

 ferent from those of the Periods preceding, the character of life 

 differed in accordance. The preceding were invertebrate, now 

 it is vertebrate, Cephalopoda are rare, reptiles appear, fishes became 

 associated with such as do occur, to regulate the number of the 

 mollusca that now begin to exist, increase and multiply. 



The Cochliodus of Springville is akin to the Port Jackson 

 Shark, which is also a cochliodont. The Cochliodus is palatal 

 forming a mouth pavement adapted to th© grinding of molluscoida 



