NOVA SCOTIAN GEOLOGY. — HONEYMAN. 215 



or mollnscan shells.. The Cochliodus of East River does not seem 

 to have been a large species ; the teeth are not over a half 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 localities are : 



1. Turnbull's mine, McLellan's Brook. 



2. Deacon McKenzie mine, New Glasgow. 



3. Crown Pottery mine, New Glasgow, 



At 1 and 2 I 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 Holoptj^chius. 



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 faunas 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 at 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 



