120 Proceedings of the Boyal Physical Society. 



all the pectoral rays are articulated up to their origins, the 

 articulations being tolerably close, although the joints for the 

 most part appear a little longer than broad. In the case of 

 the ray forming the lateral margin of the fin towards the 

 apex, the joints are, however, shorter than elsewhere — in 

 fact, shorter than broad. The marginal fulcra of the pectoral 

 are very minute and closely set. The ventral fin is imper- 

 fectly preserved ; its rays are seen to be coarser than those 

 of the pectoral, but similarly articulated, the joints being 

 longitudinally striated, and the fulcra coarser and more 

 obliquely set. The dorsal is in still worse condition than the 

 ventral, and is, moreover, displaced forwards by the distor- 

 tion of the body. Only a few of the anterior dorsal fin-rays 

 are seen, and these are tolerably coarse and divided by trans- 

 verse articulations, which are so close as to render the joints 

 nearly square; externally the rays are finely and closely 

 striated longitudinally. 



The scales are rather large; one from the middle of the 

 flank in Mr Stock's specimen measures ^ inch in height, ex- 

 clusive of the articular spine, by -^ inch in breadth ; while 

 most of those in the specimen belonging to the Scottish 

 Geological Survey are a little larger. They have the usual 

 shape found in the genus — the flank scales having their 

 upper margin rather concave, and showing a well-marked 

 articular spine, the lower margin being correspondingly 

 convex, while the anterior marginal covered area is very 

 narrow. The posterior margin is very minutely serrated — 

 so minutely that the serrations are with difficulty percep- 

 tible, even with a strong lens. The exposed surface is sculp- 

 tured with very delicate furrows, which form a pattern essen- 

 tially similar to that seen in E. striolatus and other species 

 of the Rolisoni type ; but here these furrows are much more 

 numerous and minute, in proportion to the size of the scale. 

 As in allied forms, the furrows commence oblique to the 

 anterior margin of the scale, and proceeding downwards and 

 backwards, curve round so as to become more or less parallel 

 with the lower one; towards the middle of the scale they 

 usually become faint, and more or less replaced by minute 

 punctures, which are more especially brought out when the 



