NOVA SCOTIAN GEOLOGY —HONEYMAN. AB) 
or mollusean shells. The Cochliodus of East River does not seem 
to have been a large species ; the teeth are not over ahalf of an 
inch in size. Our Cochliodus seems to have been an approximate 
cotemporary of the Gyracanthus magnificus of Cape Breton. A 
formidable and predaceous race of fishes, that pervaded the Nova 
Scotia seas of the Lower Carboniferous Period. Whence they 
came we are unable to discover. The Ichthyodorulite of Cape 
Breton in the Provincial Museum is regarded as unique; its length 
is about 22 inches, it is stout in proportion. 
MIDDLE CARBONIFEROUS. 
The last fauna is found in the coal formation polygon. 
The localites are : 
1. Turnbull’s mine, McLellan’s Brook. 
2. Deacon McKenzie mine, New Glasgow. 
3. Crown Pottery mine, New Glasgow. 
At 1 and 2 IJ found, a number of years ago, a number of teeth 
of Diplodus. They are so-called from their form which is double, 
one lanceolate is upright the other is recurved, both are crenulat- 
ed. The root has a heart-shaped prominence on its front. They 
belong to fishes of the shark family (Hybodont). 
The localities where I found them are situate on the south and 
north sides of the area; from No. 3 mine I received about the 
same time from a miner the cast of a tooth of large size, with 
its owner a Holoptychius. 
The teeth of Diplodus are of various sizes, showing a gradu- 
ation as in the mouth of the shark. Associated with these, at 
MacKay mine were large and small ganoid scales and beauti- 
fully striated spines. The late Professor John: Phillip of Ox- 
ford, seeing these specimens in my London Exhibition collection 
of 1862, remarked upon the coincidence between the Nova Scotian 
and British fawnas in both having diplodus. He also observed 
that the N.S. teeth were much larger than the British. I would 
refer to another coincidence ; the late Professor How of Windsor, 
N.S. had just discovered a trilobite in the Lower Carboniferous 
limestones of Kennetcook, N.S. and forwarded me a specimen 
for identification. I showed it to Professor Phillips as his name- 
sake (Phillipsia Howi; Billings). He also remarked upon the 
