286 Mr. A. S. Woodward — Palmichihyological Notes. 



4. On a new PaJceom'scid Fish from Siberia. 



FIsli-remains liave already been described by Dr. J. V. 

 Rohon* from some yellowish fissile marls in the neighbour- 

 hood of the Upper Jenissei, in the Government of Tomsk, 

 and the present writer has had the privilege of examining 

 the original specimens in the Museum of the Imperial Aca- 

 demy of Sciences at St. Petersburg. The collection is only 

 small, and a Swedish geologist, Herr Martin, has thus done 

 good service by obtaining a further series of specimens 

 apparently from the same formation, and presenting them to 

 the Royal State Museum, Stockholm. Herr Martin's collec- 

 tion was made at Medwiesko, near Atjinsk, in the Government 

 of Jenissei, not very far from the locality whence Dr. Rohon's 

 fossils were discovered ; and the present writer is indebted to 

 the kindness of Professor Gustav Lindstrom for the oppor- 

 tunity of carefully studying the new series. Only two genera 

 and species are represented, one an Acanthodian described by 

 Dr. Rohon under the name of Acanthodes Lopatini^ the other 

 a Palajoniscid not hitherto determined. 



Dr. Rohon regards the stratum in which the Acanthodians 

 occur as probably Devonian. The species just mentioned, 

 however, has the reduced pelvic fin-spines only found in the 

 typical Permian and Carboniferous forms of Acanthodes ; the 

 associated Gyrolepidotus Schmidti has not an early Paljcozoic 

 aspect ; and the Pala^oniscid now to be described is most 

 nearly related to Permian and Triassic genera. It is there- 

 fore very probable that the fish-bearing marls of the Upper 

 Jenissei will eventually prove to belong to the Permian 

 formation. 



Ganolepis, gen. nov. 

 Trunk elegantly fusiform, more or less elongated. Man- 

 dibular suspensorium oblique, and dentition comprising 

 conspicuous well-spaced conical laniaries ; external head and 

 opercular bones completely ornamented with striations, 

 vermiculating rugJB, and dots of ganoine. Fins small, without 

 fulcra, and the rays delicate, distally bifurcated. Dorsal and 

 anal fins triangular, the former opposed to the space between 

 the pelvic and anal fins ; upper caudal lobe slender and the 

 caudal fin forked. Scales large and thick, covered with 

 ganoine and ornamented with transverse ridges, usually 

 serrated at the hinder border ; principal flank-scales not much 

 deeper than broad, and no enlarged series of ridge-scales ; 

 lateral line conspicuous. ' 



* J. V. Eolion, " Ueber fossile Fisr-he vora oberen Jenissei," Mem. 

 Acad. Ini]>. Sci. St.-Petersbourg, [7] \o!. xx.wi. no. ].3 (1889). 



