25 
III.-CONCLUSION. 
The number of genera and species represented in the Tall)rag’ar fossil 
iisli fauna is thus comparatively small, the following being a complete list of 
the forms determined : — 
Crossopterygii. 
CffiLACANTHID^. 
Genus non det. 
Actixopterygii. 
PAL-ffiONISCID^. 
CoCCOlepis, Agassiz. 
„ australis, sp. nov. 
SEMI0N0TID7E. 
Aphnelepis, gen. nov. 
,, australis, sp. wv. 
„ -^P- 
Aetheolepis, gen. nov. 
,, mirabilis, sp. nov. 
PHOLIDOPHORIDiE. 
Archceoruffine, gen. nov. 
„ temiis, sp. nov. 
„ robuStUS, sp. nov. 
LEPTOLEPID^. 
Leptolepis, Agassiz. 
„ talbragarensis, sp. nov. 
„ Lowei, sp. nov. 
„ gregarius, sp. nov. 
Of these fishes, the Coelacantli genus and Coccolepis may he at once 
dismissed as of no stratigrapliical value. The three new genera and Leptolepis, 
however, admit of more satisfactory discussion. 
As already remarked, the only known ichthyolites closely resembling 
Aphnelepis are some detached scales from the uppermost Muschelkalk of 
Germany, the Lcttenkohlc, which may or inay not belong to a similar fish. 
It is, however, evident that Aphnelepis differs ivom Semionotus in no essential 
characters, except those of the squamation ; and as it is now generally 
admitted that thin, deeply imbricating scales result from the evolution of 
rhombic ganoid scales, it may be inferred that the Talbragar genus is more 
specialised than the familiar Semionotus. Now, the latter fish is not 
