4 A. SMITH WOODWARD, NOTES ON FOSSIL FISII-REMAINS. 



Impressions of extremely fiiie rugose markings on the surface 

 of the scale are also distinguishahle on closely examining 

 the fossil with a lens. 



The subdivision of the ridged ornament into tubercles, 

 is a common feature in Holoptychian scales; but there is no 

 known species in which the tnbercles are so regularly ar- 

 ranged in radiating series as in the scale from Bear Island 

 now described. The fine granulation of the covered portion 

 of the scale is most nsnally raet with in the Lower or 

 Middle Devonian subgenus Glijptolrpis; but it also occurs in 

 some scales of the typical Holoptychiiis from the Upper De- 

 vonian,' and has even been observed in //. nohilissimus itself.- 



III. Jursissic. 



The fish-remains from the bituminous limestone of the 

 Swedish Foreland (Svenska Förlandet), King Charles Land, 

 are merely detached and scattered bones. They all appear 

 to represent one genus and species, and must have been dis- 

 tributed by cnrrents after the disintegration of the fishes to 

 which they belong. There is only a single specimen in which 

 a few imperfect bones of a head occur apparently in natural 

 association (no. A). Many of the bones, however, are readily 

 identifiable, and a detailed comparison of them proves that 

 they are in all respects similar to the corresponding elements 

 of the well-known Jurassic genus Ij<'X>foUpis. They vary a 

 little in size, but the specimens described below are of average 

 dimensions. 



Leptolepis Nathorsti, sp. nov. (figs. 2— M). 



To begin with the jaws, the ntaxilla (fig. 2) is a broad 

 curved bone, with a convex oral horder, and the concave 

 upper börder impressed by a surface of overlap for supra- 

 maxilhiD. The bone is stoutest at its contracted anterior ar- 

 ticular end, while its exposed outer face bears traces of a 

 very fine rugose ornament. Teeth must have been very 



* Holoptychius itiJlexHS, Lohest, Aun. Soc. Géol. Belg. vol. XV (löNS), 

 p. 141. pl. IV, figs. 1—7, pl. V, fig. 4. 



2 A. S. WooDWARD, Catal. Fossil Fishes B. M. pt. II (1891), p. 323. 



