138 NEW YORK STATE MUSEUM 



known under this name and the so called D. precursor Newberry, from 

 the Corniferous Hmestone of Ohio. The typical locality for D. tubercu- 

 latus is in the Chemung conglomerate of Warren, Pa., but according to 

 Newberry, the same form occurs also in the Upper Devonic of Belgium. 



Formation and locality. Chemung beds (Chautauquan) ; Warren, Pa. 

 Also, according to Newberry, in tlie Psammites de Condroz, near Liege, 

 Belgium. Either this or a very similar species is also represented in the 

 Middle and Upper Devonic of Ohio, Wisconsin and Iowa. 



Dinichthys curtus Newberry 



1888 Dinichthys c n r t u s _/. S. Newberry. N. Y. Acad. Sci. Trans. 7:179 



1889 Dinichthys c u r t u s y. 6'. JVeuiberry. U. S. Geol. Sur. Monogr. 16:156, 



pi. 48, fig. 3 ; pi- Si^ fig- 1-4 



1893 Dinichthys curtus £. IV. Claypole. O. Geol. Sur. Rep't, 7 : 606 



1893 Dinichthys curtus A. A. Wright. O. Geol. Sur. Rep't, 7: 623 



1900 Dinichthys c u rt u s C. R. Eastman. Jour. Geol. 8: 33 



1905 Dinichthys curtus L. Hassakof. Am. Mus. Nat. Hist. Bui. 2 1 : 409, pi. 15, 

 fig. i; pi. 16 



1906 Dinichthys curtus L. Hussakof. Am. Mus. Nat. Hist. Mem. 9; p. 112, 

 text fig. 5, 1)1. 12 



Newberry's description of this species is as follows : 



Fishes of moderate or small size ; head a nearly equilateral triangle, 

 measuring about a foot on a side ; cranium, maxillary and mandible similar 

 in character to those of Dinichthys intermedius, but only half to 

 two thirds as large, and the mandible bears two subordinate prominences 

 back of the turned up toothlike extremity ; also the posterior end of the 

 cutting edge is set with two or three unequal denticles in place of the series 

 of even, lancetlike points in the same position on the mandible of D. 

 intermedius. The anterior ventrolateral plate is scimiter-shaped, 8 

 inches long by 2^ inches wide, being relatively narrower than the corre- 

 sponding bone in any other species known. 



Occurring typically in the Cleveland shale of Ohio, this species is also 



reported by Newberry from the Chemung of Pennsylvania, although no 



precise indications as to locality are given. Investigation shows that 



detached plates of a species fully as large as D. curtus, possibly even 



larger, occur in the Chemung of Warren county, Pennsylvania, but the pres- 



