108 DR RAMSAY H. TRAQUAIR ON FOSSIL FISHES COLLECTED BY 



a similar character to those on the cranial roof. The scales of the flank (fig. 3) are 

 ornamented with fine yet well-marked ridges, which pass across the exposed surface from 

 front to back in a direction mainly parallel with the upper and lower margins ; in 

 many cases the ridge is double, the two divisions uniting close to the posterior margin 

 of the scale ; in the caudal region (fig. 4) the ridges become more oblique in their 

 direction. Several large azygous scales occur in front of the dorsal fin. This fin, 

 situated about the middle of the back, is proportionally large, its rays are very slender, 

 and with unusually distant articulations ; the joints are marked occasionally with a 

 very delicate longitudinal furrow, or it may be with two ; the form of the fin would be 

 triangular acuminate were not the apical portion largely cut off by the edge of the stone. 

 The anal fin is lost ; the caudal is heterocercal, inequilobate, deeply cleft, and with 

 distantly articulated slender rays similar to those of the dorsal ; fin-fulcra few and very 

 oblique. Paired fins not preserved. 



On looking over some undetermined Eskdale material in the collection of the Royal 

 Scottish Museum, I found a small fish from Glencartholm which is certainly specifically 

 identifiable with the above-described example from Gullane, and which is represented in 

 PI. I. fig. 5. It is slightly larger, as it measures nearly 3 inches in length, and is 

 more perfect, inasmuch as its contour is seen from the tip of the snout to the termina- 

 tion of the upper lobe of the tail-fin. The length of the head is contained about four 

 times in the total ; its superficial bones are sculptured, as in the Gullane specimen, with 

 comparatively coarse and distant ridges, and the form and ornament of the scales is also 

 the same. As in the above-described specimen, the paired fins are not shown, while, in 

 addition, the dorsal is wanting ; on the other hand, the anal is present and the caudal is 

 complete. We have again the same character of the fin-rays, — as before, they are very 

 slender and very distantly articulated, while the fulcra in front of the anal and caudal 

 are few, elongated, and oblique. 



I have placed this little fish in the genus Elonichthys on account of its general 

 aspect and the form and position of the unpaired fins, though the condition of the fin- 

 fulcra deviates considerably from that which is usual in the genus. In all its details it 

 is strikingly distinct from every other known species. 



The specimen, PI. II. fig. 2, collected by Mr Macconochie at Gullane, is from 

 bed a. 



Genus Rhadinichthys, Traquair. 

 Rhadinichthys ornatissimus, Agassiz, sp. 



1835. Palxoniscus ornatissimtis, Agassiz, Poiss. Foss., vol. ii. pt. i. p. 92, pi. x.a figs. 6, 8 (non figs. 5, 7). 

 1877. Rhadinichthys ornatissimus, R. H. Traquair, Qu. Journ. Geol. Soc, vol. xxxiii. p. 559, and 



Proc. Roy. Soc. Edinb., vol. ix. p. 432. 

 1877. Rhadinichthys lepturus, R. H. Traquair, Proc. Roy. Soc. Edinb., vol. ix. p. 437. 



1890. Rhadinichthys ornatissimus, R. H. Traquair, Proc. Boy. Soc. Edinb., vol. xvii. pp. 391, 397. 



1891. Rhadinicldhys ornatissimus, A. S. Woodward, Cat. Foss. Fishes Brit. Mus., pt. ii. p. 462. 



