Il6 NEW YORK STATE MUSEUM 



terminates abruptly at some distance in advance of the posterior margin. 

 The latter is continued backward in triangular fashion, but is not produced 

 into a long spine as in C. o c c i d e n t a 1 i s. This unique specimen, which 

 probably belongs to a distinct species, is interesting in view of the horizon 

 from which it was obtained, and on account of the great rarity of Coccosteus 

 remains in this country. It seems inadvisable to propose a new specific 

 title for it, however, until other parts of the skeleton are known. 



Coccosteus macromus Cope 

 1892 Coccosteus macromus E. D. Cope. Am. Soc. Phil. Proc. 30: 225 

 Of this species no other examples are known except those obtained by 

 Professor Cope, whose original description follows : 



Fragments of this species are abundant in the Chemung rocks at Leroy 

 [Pa. J, and I select as typical of it a pair of supraclavicular and adjacent 

 pieces, which display its characters best. The supraclavicle has lost the 

 condylar articulation. Both extremities display the unsculptured surface, 

 and the usual groove extends obliquely across the sculptured portion at 

 about two fifths the length from one of the extremities. The sculpture con- 

 sists of obtuse tubercles with delicate radiate-grooved bases, which are usu- 

 ally separated by spaces equal to their own diameters, sometimes by 

 narrower spaces, but never by spaces which are wider. At some points 

 they have a linear arrangement. This sculpture is coarser than in the C. 

 americanus \i. c. C. o cc i d e n t a 1 i s] Newberry [i'cr The Palaeozoic 

 Fishes of North America, by this author], but resembles that of C. d e c i p- 

 iens Agass. of Scotland. From this species the C. macromus differs 

 in the elongate form of the supraclavicle which is relatively short and wide 

 in the C. d e c i p i e n s \sec Agassiz, in the Poissons du Vieux Ores Rouge, 

 and Zittel, Handbuch der Palaontologie]. 



Length of supraclavicle ----- 35nim 



Width just above condyle - - - - - 16 " 



Formation and locility. Chemung beds (Chautauquan) ; Leroy, Pa. 



