f JSHES OF THE DEVONIAN SYSTEM. 



GANOIDEl. 1 



i 



PLA CODJEBMI 



Genus DmiCHTHYS, Newb. 



Since the publication of the first vohime of this Eeport, a large amount 

 of interesting material, illustrating the structure of this genus, has been 

 brought to light. In this material is to be found nearly the entire bony 

 system of one large individual, which gives us a more complete repre- 

 sentation of Dinichthys than has yet been obtained of any of the larger 

 fossil ashes of the Old "World. These specimens we owe to the enthu- 

 siasm and intelligence of Mr. Jay Terrell, who found them at his home 

 in Sheffield, Lorain Co. Here the upper portion of the Huron shale 

 forms, along the Lake Shore, cliffs, which are being constantly worn away 

 by the waves. These cliffs have been Mr. Terrell's favorite hunting 

 ground, and as the erosion of the surface revealed here and there the 

 projecting point of a bone, each indication has been followed up witli 

 care, and the bone taken out, perhaps in many fragments, but yet com- 

 plete in all its parts. Mr. Terrell has carefully preserved and united 

 these fi-agmenfs, and thus has been able to contribute to science some of 

 the most interesting and valuable palseontological material ever disr 

 covered. Some months since, while scanning the cliffs near his house, 

 his attention was attracted to a bone of which only a small portion was 

 visible, the remainder being concealed in the rock. On taking this out, 

 others immediately associated with it were revealed, which were, how- 

 ever, so deeply buried, as to be inaccessible by ordinary means. Li 

 these circumstances Mr. Terrell began operations on a shoulder of the 

 cliff immediately above, and excavated a space about twelve feet square 

 down to the locality of the bones. Here he found the ventral shield, 

 before unknown, quite complete; one perfect mandible, a "premaxil- 

 lary," and two " maxillaries ; " a perfect dorsal shield, two feet in diam- 

 eter ; two seapulo-coracoids, with a large number of additional bones, 

 including the ossified rays of a large fin. From the same locality Mr. 

 Terrell had before obtained a cranium almost complete, and two Supra- 



