464 
ACTIXOrTEUYGII. 
Rhadinichthys elegantulus,^aquam 
1881. Rhadinichthys yeikiei, It. H. Traquair (errore), Trans. Roy. Soc. 
Edinb. vol. xxx. p. 25, pi. i. figs. 13-18. 
1881. Rhadinichthys yeikiei, var. elegantulus, R. H. Traquair, ibid. 
p. 27, pi. ii. figs. 1-5. 
1881. Rhadinichthys delicatidus , R. H. Traquair, ibid. p. 29, pi. ii. 
figs. 6-9. [Geological Survey of Scotland.] 
1890. Rhadinichthys elegantulus (vritli var. delicatulus ), R. H. Traquair, 
Proc. Roy. Soc. Edinb. vol. xvii. p. 398. 
Type. Eisbes ; 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. Eour specimens, one being in counterpart. 
Pur chased, 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 
