86 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



Dinomylostoma buffaloensis, n. sp. 



(PI. 23, fig. i; pi. 24, figs. I, 2, 4, 5; text-fig. 29) 



E 1961 Cotypes. — (i) A right mandible lacking posterior half of the 

 blade or inserted portion, free from matrix. Length as 

 far as preserved, 106 mm. (Fig. 29; PL 24, fig. i.) 



E 1965 (2) A left mandible, lacking only the extreme end of the 

 blade portion. The entire inner face, as well as the 

 greater portion of the outer, are clear of matrix. Length 

 as far as preserved, 136 mm. (PI. 24, fig. 2.) 



Formation and Locality. — Conodont bed (Genesee); Eighteen Mile 

 Creek, near North Evans railroad bridge, Erie County, N. Y. Col- 

 lected by W. L. Bryant. 



Functional portion occupying about I the length of the mandible, 

 and not demarcated on outer face from inserted portion. Oral mor- 

 gin, in outer view, strongly concave, rising rather abruptly posteriorly 

 so as to form an angle at its point of junction with the blade portion, 

 Tritoral area broadest somewhat in front of its middle, its greatest 

 width contained from i| to nearly 3 times in the depth of outer face 

 measured at middle of functional portion. Symphysis with three or 

 four denticles, not always clearly shown. Margin immediately 

 behind tritoral area, a compressed cutting edge, about half the length 

 of the tritoral region. Inferior margin in front portion of mandible 

 with a deep groove for attachment, extending forward to where the 

 inferior margin blends into the front margin of the mandible. 



Remarks. — This species is represented in the collection by the co- 

 types and by several other mandibles, one about the size of the co- 

 types, the others all smaller. Cotype i, (fig. 29) shows the front half 

 of the mandible in splendid preservation, lacking only the tip of the 

 beak. Cotype 2, is less perfect, but shows almost the entire mandible 

 including the blade or inserted portion. The functional portion in 

 this element agrees closely with that of cotype i . Among the smaller 

 specimens; E 1966 shows the S3miphyseal denticles well. 



This is the third species of Dinomylostoma to be described, the other 

 two being, Dinomylostoma beecheri Eastman,^'' from the Portage of Mt. 

 Morris, N. Y. ; and D. eastmani Hussakof ,^^ from the New Albany or 



s' Amer. Journ. Sci., 4 ser., xxi, 137, text- fig. 2, igoS; also a fuller discussion in Bull. MuSm 

 Comp. ZooL, L, 23-29, pi. 1, figs. 4, s; pl- 2, figs. 13, 14; Pis. 4, 5; text-figs. F-H, 1906. 

 ^^Bull. Amer. Mus. Nat. Eist., xxxii, 245, pl. xlvii, ng. 7 and text-fig. i B. 1913. 



