DEVONIC FISHES OF THE NEW YORK FORMATIONS 



139 



ent writer is unacquainted with any evidence which will enable one to state 

 positivel)- that the species is identical with any of the Ohio forms. It is to 

 be hoped that more characteristic remains from the eastern region may yet 

 be brought to light. Quite recently the Ohio material has been subjected 

 to a renewed examination by Mr L. Hussakof, of the American Museum at 

 New York, who gives a restoration of the ven-tral armoring [1905, p. 412], 

 and discusses the arrangement of jaw parts (1906, p. 112). 



Formation and locality. Cleveland shale (Upper Devonicj ; Ohio. 

 Presumably also in the Chemung of Pennsylvania. 



Dinichthys sp. ind. 

 Amongst the series of fish remains collected by Professor Charles S. 

 Prosser from the Chemung of Delaware county, New York, and from the 

 Catskill beds near Palenville, occur fragments of small Dinichthyids 

 agreeing in size with the plates of D. t u be r c u 1 a t u s, but too poorly 

 preserved for satisfactory determination. Figures are given of two of these 

 plates in an appendix to Professor Prosser's paper on the " Hamilton and 

 Chemung Series of Central and Eastern New York," published in the i-jth 

 Annual Report of the Neiv York State Geologist for the year 1897. In 

 addition, there is preserved in the State Museum at Albany one very perfect 

 example of the postero-dorsolateral plate belonging to an unknown species 

 of Dinichthys, from the Chemung of Franklin, in Delaware county. It has 

 a total length of about 30 cm, is finely tuberculated, and shows impressions 

 of sensory canals on the external surface \see pi 6, fig. i]. The same 

 museum also possesses an imperfect head shield, preserved so as to show 

 the visceral aspect, of a small Dinichthyid from the* Oneonta sandstone 

 of Oxford, N. Y., its general appearance being suggestive of D. p u s t u- 

 1 o s u s, but having a width of only 9 cm across the posterior border. 

 Other obscure fragments are known from the lower Genesee of Eighteen 

 Mile creek, near Buffalo, and from Hamilton rocks at Haight's Quarry, 

 Cazenovia, N. Y. The Black slate of Kentucky, a horizon just above the 

 Hamilton, also yields a considerable number of fragments. 



