﻿K)2 ACTIXOIM'ERYGII. 



of moderate size, consisting of delicate rays, distally bifurcated, with 

 an anterior series of slender fulcra ; principal rays of pectoral tin 

 nnarticulated except near their distal extremity. Dorsal and anal 

 tins triangular, partly or completely opposed ; upper caudal lobe 

 slender, and caudal fin deeply forked, unsyrnmetrical. Scales 

 large or of moderate size, more or less delicately sculptured ; 

 ridge-scales iu advance of dorsal fin much enlarged. 



Rhadinichthys ornatissimus (Agassiz). 



18-55. Palceoniscus ornatissimus, L. Agassiz, Poiss. Foss. vol. ii. pt, i. 



p. 92, pi. x. a. figs. (3, 8 (non figs. 5, 7). 

 1877. Rhadinichthys ornatissimus, R. H. Traquair, Quart. 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. [Imperfect fish ; Edinburgh Museum.] 

 1890. Rhadinichthys ornatissh?ius, R. H. Traquair, Proc. Roy. Soc. 



Edinb. vol. xvii. pp. 391, 397. 



Type. Imperfect fish ; Edinburgh Museum. 



The type species, attaining a length of about 0*25. Head with 

 opercular apparatus occupying about one-fifth of the total length ; 

 greatest depth of trunk immediately behind the operculum, and 

 tail-pedicle narrow. Head - bones finely and closely striated. 

 Paired fins small, the pectoral about one half as long as the head ; 

 dorsal fin arising slightly in front of the anal, shorter than the 

 latter, both these fins with much excavated posterior margins. 

 Scales of flank relatively large, somewhat deeper than broad . 

 Scale-ornament consisting of sharp, delicate striae, mostly paralle 1 

 with the superior and inferior margins, sometimes sigmoidally 

 curved, with punctures in the intervening furrows ; posterior 

 margin serrated. 



Form. 6f Loc. Calciferous Sandstones : Midlothian and Fifeshire. 



P. 3439. An imperfectly preserved fish wanting the head, and an 

 imperfect caudal region ; Burdiehouse, near Edinburgh . 



EnnisMllen Coll. 



P. 1000. Remains of small trunk; Gran ton, near Edinburgh. 



Egerton Coll. 



41129. Imperfect small fish ; (?) Burntisland, Fifeshire. 



Br y son Coll. 



