﻿4(3-1 ACTIN0PTERYG1I. 



Rhadinichthys elegantulus, Traquair. 



1881. Rhadinichthys geikiei, R. H. Traquair (errore), Trans. Roy. Soc. 



Edinb. vol. xxx. p. 25, pi. i. figs. 13-18. 

 1881. Rhadinichthys geikiei, var. elegantulus, R. H. Traquair, ibid. 



p. 27, pi. ii. figs. 1-5. 

 1881. Rhadinichthys delicatulus, R. H. Traquair, ibid. p. 29, pi. ii. 



figs. 6-9. [Geological Survey of Scotland.] 

 1890. Rhadinichthys elegantulus (with var. delicatulus), R. H. Traquair, 



Proc. Roy. Soc. Edinb. vol. xvii. p* 398. 



Type, Fishes ; Geological Survey of Scotland, Edinburgh. 



A species attaining a length of about 0'1-0*15. Length of head 

 with opercular apparatus somewhat exceeding the maximum depth 

 of the trunk, and contained slightly more than four times in the 

 total length : external bones ornamented with fine, vermiculating 

 striae, rarely passing into tubercles. Pectoral fins relatively small, 

 their length scarcely equalling more than half that of the head ; 

 pelvic fins small and delicate ; dorsal and anal fins of moderate 

 size, similar, the former arising very slightly in advance of the 

 latter. Elank-scales as broad as deep, ornamented with few very 

 delicate, closely arranged striae parallel to the anterior and inferior 

 margins, and about four or five large oblique ridges extending 

 across the posterior smooth area to a corresponding number of 

 large denticulations of the hinder border ; narrow ventral scales 

 similarly marked, but with only two or three denticulations ; scales 

 of caudal region nearly smooth, with few large denticulations and 

 short ridges. 



Form. £f Loc. Calciferous Sandstones (Cement-stone Group) : 

 Eskdale, Dumfriesshire. 



P. 4075-6. Pour specimens, one being in counterpart. 



Purchased, 1883. 



P. 4075 a. Imperfect specimen, probably of this species. 



Purchased, 1883. 



Rhadinichthys macconochii, Traquair. 



1881. Rhadinichthys macconochii, R. H. Traquair, Trans. Roy. Soc. 

 Edinb. vol. xxx. p. 30, pi. ii. figs. 12-16. 



Type. Imperfect fish ; Geological Survey of Scotland, Edinburgh. 



A small species attaining a length of about 0*025. Length of 

 head with opercular apparatus equal to the depth of the trunk 

 midway between the pectoral and pelvic fins, occupying nearly one 



