36 CATALOG OP FOSSIL FISHES IN THE MUSEUM 



specimen of this species. Their unusual appearance is due to their 

 little wear by use, the beak still retaining its juvenile pointed con- 

 dition, and the excavation back of it, produced by the upper "tooth," 

 being still but little worn down. 



If we compare the mandibles with the figures of those of Dinich- 

 thys intermedius given by Newberry {Paleoz. Fishes of N. A., 1889, 

 PL x), we find them closely similar to the latter. Thus, the func- 

 tional part is somewhat shorter than the blade portion; the depth 

 of the functional portion, at its middle, is contained li times in 

 the depth of the blade portion, at its middle; and the depth at the 

 junction of the blade and functional portions (measured from the 

 upper point of junction) is contained 23 times in the length of the 

 blade portion. These proportions correspond so closely with those of 

 the mandible of Dinichthys intermedius, as to lead us to believe that 

 the present specimens probably belong to this species. 



Dinichthys magnificus, n. sp. 



(Pis. I, 7, 8, 9; PI. 17, fig. 3; PL 22, fig. I ; text-figs. 7, 8, 9, 11, 12) 



The most impressive and perhaps most valuable specimen of the 

 entire collection in the Buffalo museum, is a magnificent head and 

 body armor of a large species of Dinichthys. It was found in a huge 

 concretion (fig. 7) derived from near the base of the Rhinestreet shale. 

 A portion of the concretion was discovered by Mr. Frederick 

 Houghton, of the Buffalo museum, and the remainder, which had 

 drifted out of place, was found the following year by Mr. Bryant. 

 The specimen exhibits the head and most of the body plates of a huge 

 Dinichthys. Several of the plates were extricated from the matrix, 

 others were carefully copied in plaster, or squeezes were made of those 

 represented by impressions, and the whole has been set up in a restora- 

 tion which makes a splendid exhibition specimen (PL i). It is 

 clear that the species is different from any other known, and we 

 therefore describe it here as new. 



E 2381 Type. — Head and body armor of a large Dinichthys, in a con- 

 cretion. The plates present are shown in figure 8, in 

 which the specimen is represented as if laid out flat. 

 The parts preserved are the head shield; a complete scle- 

 rotic ring, composed of four segments, a fragment of the 



