﻿PAL^EONISCID.aE. 465 



quarter of the total length. Cranial roof-bones ornamented with 

 close, comparatively coarse tuberculations, frequently confluent ; 

 other external bones marked with coarse striae, much subdivided 

 into tubercles on the mandible. Pins as in R. elegantulus. Scales 

 of flank scarcely deeper than broad ; none posteriorly denticulated. 

 Scale-ornament consisting of few well-spaced striae parallel with 

 the anterior and inferior borders, a few faint oblique ridges also 

 crossing the postero-superior area. 



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

 Eskdale. 



P. 4077. Specimen, in counterpart. Purchased, 1888. 



Rhadinichthys cairnsi (Jackson). 



1851. Palceoniscus eairnsii, C. T. Jackson, Rep. Albert Coal Mine, 

 p. 23, pi. i. fig. 3. 



1852. Palceoniscus eairnsii, C. T. Jackson, Proc. Boston Soc. Nat. Hist, 

 vol. iv. p. 139. 



1877-78. Palceoniscus eairnsii, J. W. Dawson, Canadian Nat., n. s. 

 vol. viii. p. 339, and Acadian Geology, Suppl. p. 100. 



Type. Imperfect fish. 



Trunk robust, with slender caudal pedicle, the maximum depth 

 somewhat greater than the length of the head with opercular 

 apparatus, and contained about four and a half times in the total 

 length. Dorsal fin shorter than the anal, arising slightly in 

 advance of the latter. Scales of flank scarcely deeper than broad ; 

 scale-ornament consisting of delicate transverse striae, partly 

 parallel with the inferior border, and terminating in very fine 

 serrations of the posterior border. 



Form. § Loc. Lower Carboniferous : Albert Co., New Brunswick. 



P. 2274. Specimen about 0*115 in length • Hillsborough. 



Egerton Coll. 



Rhadinichthys alberti (Jackson). 



1851. Palceoniscus alberti, C. T. Jackson, Rep. Albeit Coal Mine, p. 22, 

 pi. i. fig. 1. 



1852. Palceoniscus alberti, C. T. Jackson, Proc. Boston Soc. Nat. Hist, 

 vol. iv. p. 138. 



1877. Rhadinichthys albertii, R. H. Traquair, Quart. Journ. Geol. Soc. 



vol. xxxiii. p. 559. 

 1877-78. Palceoniscus alberti, J. W. Dawson, Canadian Nat., n. s. 



vol. viii. p. 338, and Acadian Geology, Suppl. p. 100. 

 part u. 2i 



