214 NOVA SCOTIAN 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 Bellerophon 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 subverial, 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 
Archeean, 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 the grinding of molluscoida 
