the Karoo formation of South Africa. 395 
it cannot be distinguished from the genus Rhadinichthys ; if 
it belongs to the family Catopteridee it may be assigned to 
Dictyopyge. As a provisional determination the latter course 
is here preferred ; for the Australian fishes already mentioned 
occur in association with Clethrolepis, and so also does the 
new specimen discovered by Mr. Draper. 
Specific Determination —Whether, however, this fish 
belongs to Rhadinichthys or to Dictyopyge, the combined 
characters of the scales and fins are sufficient to distinguish it 
from all known forms, and it may therefore receive the specific 
name of Draperi. 
Formation and Loc.—Stormberg Beds (Upper Karoo) ; 
Rouxville, Orange Free State. 
2. Atherstonia minor, sp. n. 
(PI. XVII. figs. 2, 2a.) 
Type.—This species is founded on the middle portion of a 
small fish shown of the natural size in Pl. XVII. fig. 2, while 
the greater part of the trunk of a still smaller fish adds some 
further particulars concerning the dorsal fin and squamation. 
Both specimens were discovered by Professor H. G. Seeley, 
H.R:S: 
Description.—The fish thus indicated was evidently elon- 
gate-fusitorm in shape, with relatively large and extended 
pelvic and anal fins. ‘lhe depth of the trunk at the origin of 
the anal fin is about equal to the space between the latter and 
the origin of the pelvic fins. The fin-rays are numerous and 
slender, and those of the median fins are shown to be distantly 
jointed ; fulera are not preserved. ‘he dorsal fin arises very 
slightly in advance of the anal, but its relative proportions 
cannot be determined. ‘The scales of the middle of the flank 
are scarcely deeper than broad, and only those of the caudal 
region are strengthened by an inner rib; all the abdominal 
flank-scales, however, are united by a prominent peg-and- 
socket articulation. ‘The scales are narrowed dorsally and 
ventrally, and there is evidence of a continuous series of 
greatly enlarged dorsal ridge-scales, besides a large median 
scale at the origin of the anal fin. Hach flank-scale is marked 
by from four to six oblique longitudinal ridges, mostly con- 
tinuous, but not parallel and not always straight, being 
slightly curved; while the dorsal ridge-scales are similarly 
ornamented by longitudinal lines. None of the scales are 
serrated. 
Generic Determination.—Vhe characters of the imperfect 
fossils thus described suffice to place them in the Paleoniscid 
