226 Mr. D. Sharpe and Sir P. Egerton on Fossils from South Africa. 



unequal, vertical teeth, closely set in one series. (Only an internal cast has 



been seen) 



Length ^ inch ; breadth f inch. 



Found at Graaf Reinet. (From the Geological Society's Collection.) 



Fig. 2a, hinge-line of 2b. Fig. 2b, internal cast of the right valve (reversed in 



the plate). 



Iridina? -ovata, Sharpe. PI. XXVIII. figs. 3 & 4. 



I. ? testa transversim ovat4, antice rotundata, postice producta et oblique tnincata, concen- 

 trice rugulosa : margine ventrali medio depresso : umbonibus prominentibus : linea cardinal! 

 arcuata, dentibus 12 parvis, verticalibus, uniseriatis. 



Shell transversely ovate ; anterior end rounded ; posterior end somewhat pro- 

 duced and obliquely truncated ; middle of the ventral margin slightly depressed : 

 valves ornamented with numerous unequal concentric wrinkles : umbones pro- 

 minent : hinge-line arched with about twelve small vertical teeth, closely set in 

 one series. 



Length ^ inch ; breadth yo inch. 



Found at Graaf Reinet. (From the Geological Society's Collection.) 



Fig, 3, an internal cast, with teeth like those of fig. 2u: left valve (reversed). 

 Fig. 4, exterior, somewhat restored : left valve (reversed). 



Note on the Fish-remains from Styl Krantz, South Africa. 

 By Sir P. De M. Grey Egerton, Bart., M.P., F.R.S., F.G.S. &c. 



[Plate XXVIII. figs. 26-42.] 



I have examined the fish-remains forwarded by Mr. Bain to the Geological 

 Society from South Africa. The materials are very scanty, as the specimens only 

 exhibit scattered scales ; but I am inclined to believe that they are all referable 

 to the genus PalcBoniscus. 



If I am correct in this inference, the characters of the individual scales indicate 

 two species, both of which appear to be new : — one having the surfaces of the 

 scales profusely ornamented with sinuous grooves, and their posterior margins 

 deeply incised, — the other having the surfaces comparatively smooth, and the 

 posterior margins only slightly serrated. 



The specimens figured 41 and 42 of the plate are from the series of elongated, 

 imbricated, fulcral scales covering the base of the upper lobe of the tail. 



