396 Mr. A. 8. Woodward on Fossil Fishes from 
genus Atherstonia, already obtained from the Beaufort Beds 
of Colesberg, Cape Colony; the enlarged series of dorsal 
ridge-scales combined with the arrangement of the fins and 
the nature of the scale-ornament being especially diagnostic. 
Specific Determination.—It is, indeed, difficult to distinguish 
the new fossils, except in size, from the typical Atherstonia 
scutata. ‘The species discovered by Professor Seeley, how- 
ever, seems to have had a somewhat more robust trunk, with 
the dorsal fin slightly more remote than in the fish already 
known; it may therefore be recorded as Atherstonia minor. 
form. and Loc.—Beaufort Beds (Lower Karoo) in asso- 
ciation with Theriodont Reptiles; Klip Fontein, on the farm 
of the Brothers Erasmus, 8.W. of Fraserburg, Nieuwveldt 
Range, Cape Colony. 
3. Atherstonia Seeleyt, sp. n. 
(Bl XV Tl Sigs. 303 2.) 
Type.—The only known fragment of this species is shown 
of the natural size in Pl. XVII. fig. 3, with impressions of 
four scales enlarged in fig. 3a. It was discovered by Pro- 
fessor, H. G. Seeley, F-R.S. 
Deseription.—The fish must have had a comparatively 
deep trunk, but it is impossible to obtain any of the propor- 
tions from the single known specimen. Of the fins, only one 
of the pelvic pair and the anal are preserved, both comprising 
numerous distantly articulated rays, of which some apparently 
show traces of a longitudinal striation. The pelvic fin has 
a much extended base-line, and is considerably smaller than 
the anal fin. All the scales preserved, except at the ventral 
border, are much deeper than broad, and those immediately at 
the base of the anal fin, though relatively very small, are 
equilateral. There seems to have been one enlarged ridge- 
scale at the origin of the anal fin. ‘The scales of the flank 
are united by a large peg-and-socket articulation, but there 
are no indications of an internal median rib, and all are 
elaborately ornamented with conspicuous oblique ridges. A 
natural impression of the external surface of four adjoining 
scales is shown of four times the natural size in fig. 3a, and 
it will be observed that the irregular oblique ridges exhibit a 
tendency towards convergence at the postero-inferior angle. 
Generic Determination.—It is evident that the ichthyolite 
thus described belongs either to the Paleoniscide or to the 
Platysomide ; and on account of the great development of 
the pelvic fins we prefer to assign it to the first family. The 
few generic characters enumerated are the same as those of 
