DEVONIAN FISHES OF IOWA 257 



three species have been founded upon portions of the squama- 

 tion. These have been doubtfully referred to the genus Palae- 

 oniscus under the names of P. antiquus and P. reticulatus 

 Williams, * and P. devonicus Clarke,f but are more properly as- 

 signable to Rhadinichthys. The two first-named are from the 

 Portage beds near Buffalo, New York, and the last-named, much 

 more complete than the others, is from the Naples beds of 

 Sparta, in the same State. A re-investigation of the type 

 of the Naples species enables us to add a few details to 

 the extant knowledge of its characters, which are recorded be- 

 low. In addition, one new species showing very remarkable 

 features is described, and the characters of several imperfectly 

 known and hitherto unillustrated forms belonging to the same 

 genus are set forth as the result of recent study of the type 

 specimens, whose whereabouts had for many years been lost 

 sight of. The types referred to are the originals of two or three 

 species of Ehadinichthys and Elonichthys described by Dr. C. 

 T. Jackson in 1851 from the Albert coal mine of New Bruns- 

 wick. There is no record of their early history, but ten of them 

 became the property of the Boston Society of Natural History, 

 and several were afterwards acquired by the Harvard Museum. 

 Their identification was made possible quite recently through 

 the discovery in the Redfield collection at Yale of two unpub- 

 lished lithograph plates by Sonrel which had been struck off 

 subsequent to the issue of Jackson's Report, but appear never 

 to have been regularly distributed. Through the kindness of 

 Professor Charles Schuchert it has been possible to provide 

 photographic copies of these proofs for the use of students in 

 different museums. 



Genus RHADINICHTHYS Traquair. 



Trunk elegantly fusiform, more or less elongated. Mandib- 

 ular suspensorium very oblique; teeth in two series, a small 

 outer row and larger incurved conical laniaries, well-spaced, 



♦Williams, H. IT., Bull. Buffalo Soc. Nat. Sci. (1886), 5, p. 84, fig. 2. 

 t Clarke, J. M., Bull. U. S. Geol. Surv. no. 16 (1885), pp. 20, 41, pi. 1, figs. 

 2,6. 



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