Dr R. H. Traqxiair on Fossil Fishes from Oil Shales. 121 



scale is held in certain positions. Towards the posterior 

 margin the furrows become again more marked, and terminate 

 between the minute serrations of the edge. No satisfactory 

 view is afforded of the scale sculpture behind the region of 

 the ventral s. 



Remarks. — Scanty as are the materials for the description 

 of E. tenuiserratus, its characters are so clear and striking 

 that it cannot be confounded with any other species hitherto 

 described. We have before us a fish allied to those species 

 of Elonichthys which may be classed together as the " Rohi- 

 soni type," but at once distinguishable from all of them by 

 the fineness and closeness of the ornament on the cranial 

 bones ; and as regards the scales, by the extreme delicacy of 

 their sculpture and the minuteness of their marginal serra- 

 tions, which the comparatively large size of the scales renders 

 all the more conspicuous. The pattern of the ridges on the 

 facial bones differs also somewhat from that in allied forms ; 

 but for purposes of diagnosis, a single scale from the flank 

 is sufficient. 



(4.) Elonichthys pectinatus, Traquair. 



Elonichthys (1) pedinatus— TiaqvLSiiT : " Proc. Roy. Soc, Edin.," May 1877, 

 p. 430. 



In the " Proceedings of the Eoyal Society of Edinburgh " 

 for May 1877, I described, under the name of Elonichthys (?) 

 pectinatus, certain scales from the Carboniferous Limestone 

 Series of Gilmerton, Levenseat, and Carluke, referring them 

 provisionally to that genus, until further information could 

 be had regarding the fish to which they' belonged. The 

 description which I gave at that time I may here quote in 

 full: 



" Flank scales about ^ inch broad, and usually a little 

 higher, exclusive of the articular spine; moderately thick. 

 Upper margin with prominent articular spine ; anterior 

 covered area narrow; exposed surface brilliantly ganoid, 

 sculptured with oblique, sub-parallel prominent ridges, occa- 

 sionally branching, anastomising, and intercalated, and ter- 

 minating behind in delicate denticulations of the posterior 



