the Karoo Formation of South Africa. 395 



it cannot be distinguished from the genus Rhadinichthys ; if 

 it belongs to the family Catojiteridge 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 Cleithrolepis, 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. 

 (PL XVll. figs. 2, 2 a.) 



Type. — This species is founded on the middle portion of a 

 small fish shown of the natural size in Pi, XVlI. fig. 2, while 

 the greater part of the trunk of a still smaller fish adds some 

 further particulars concerning the dorsal fin and squamation. 

 Botli specimens were discovered by Professor H. G. Seeley, 

 F.R.S. 



Description. — The fish thus indicated was evidently elon- 

 gate-fusitorm in shape, with relatively large and extended 

 pelvic and anal fins. The 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; fulcra are not preserved. The dorsal tin arises very 

 slightly in advance of the anal, but its relative proportions 

 cannot be determined. The scales of the middle of the fiank 

 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. Each fiank-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. — The characters of the imperfect 

 fossils thus described suffice to place them in the Pala3oniscid 



