PAL^OlsTLSCIDiE. 
465 
quarter of the total length. Cranial roof-bones ornamented with 
close, comparatively coarse tuberculations, frequently confluent; 
other external hones marked with coarse strise, much subdivided 
into tubercles on the mandible. Fins 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, Log. Calciferous Sandstones (Cement-stone Group) : 
Eskdale. 
P. 4077. Specimen, in counterpart. Purchased , 1883. 
Rhadinichthys cairnsi (Jackson). 
1851. Palceoniscus cairnsii, C. T. Jackson, Rep. Albert Coal Mine, 
p. 23, pi. i. fig. 3. 
1852. Palceoniscus cairnsii, C. T. Jackson, Proc. Boston Soc. Nat. Hist, 
vol. iv. p. 139. 
1877-78. Palceoniscus cairnsii, 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. <$f Log. 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. Albert Coal Mine, p. 22, 
pi. i. fig. 1. 
1852. Palceoniscus alberti, 0. T. Jackson, Proc. Boston Soc. Nat. Hist, 
vol. iv. p. 138. 
1877. Ehadinichthys 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. 
PAET II. 2 H 
