300 THE CANADIAN NATURALIST. [Jan. 



Macropoma and Coelacanfhus. The numerous and very com- 

 plete specimens of Coelacanthus exhibited, supply much that was 

 wanting to a perfect knowledge of the anatomy of this genus. 

 The bones of the head are similar in form to those of Macropoma , 

 are highly ornamented with tubercles above and thread lines below ; 

 the jugular plates are double and long-elliptical as in Uhdina and 

 Macropoma, but the teeth are conical and curved. The position 

 and form of the fins is as in Uhdina, but the anterior dorsal is 

 stronger. The fins are supported on palmated interspinous 

 bones, similar in a general way to those of the other genera of the 

 family. The paired fins are slightly lobed. The supplemental 

 caudal has been referred to ; the scales are ornamented with 

 curved and converging raised lines. In many specimens the 

 earbones (otolites) are distinctly visible. Besides the fishes 

 found at Linton already enumerated, there were scales and teeth 

 of Rhizodus, two species, at least one of which (P. angustus) has 

 teeth of two forms, — one large, flattened, and double-edged ; the 

 others smaller, more numerous, slender, striated, and conical, 

 with a circular section throughout ; two species of Diphdus, 

 consisting of bony base and enamelled crown, — the latter distinctly 

 and beautifully serrated ; so that there can scarcely be a question 

 that they were teeth, and not, as claimed by Mr. Atthey, of 

 Newcastle, England, dermal tubercles. 



In the Linton fauna is one species of Pakvoniseus (i 3 . Scuti- 

 gerus, JSf.) ; one of Pygopterus ; one of MegaUchthys, represented 

 by scales ; and numerous spines of placoid fishes of the genera 

 Compsacanthus and Pleuracanthus. 



The fish remains from Illinois consisted of a splendid specimen 

 of Edestus vorax (Leidy) from the coal at Bellville, opposite St. 

 Louis, and of several individuals of a new species of Platysomus 

 from the concretions of iron ore at Mazon Creek. The Edestus 

 was said by Dr. Newberry to have been described as a jaw, but 

 the specimen exhibited was much more complete than any before 

 found, and there could scarcely be a doubt that it was the spine 

 of a Selachian. Platysomus, he said, though common in the 

 coal measures of England, had not been before found in America. 

 The fishes from the Waver ly were from a new locality, and 

 from a horizon that had furnished very few fossils of any kind, 

 and no fishes except a Palaeoniscus (P. Brainerdi) found in 

 northern Ohio. The specimens collected at Vanceburg, by Dr. 

 Patterson, consisted of teeth of Cladodus and Orodus, with spines 



