4 
surviving in the Mesozoic lias liitherto been olitained ; and the ITawkeshnry 
genus will be notewortby, if rutnre discoveries confirm the impressions 
derived from tlie fossil just described. 
Order.— DIPNOI. 
Family. — UNCERTAIN. 
Genus — GOSEOE.DIA, gen. nov. 
Gen. Char. — Head very small ; snout pointed ; trunk elongate, tbougb 
comparatively deep, laterally compressed ; median fin continuous ; pelvic 
fins acutely lobate, biscrially fringed ; scales very small, delicate, over- 
lapping, marked by line striie. 
01)3. — Tbougb thus imperfectly known, the generic distinctness of 
this fisli from all other Hipnoans as yet sufficiently defined seems tolerably 
evident. If Phaneroplcuron belongs to the Hipnoan order, it is readily 
distinguisbed by the separate anal iln ; and the only other genera with wliicb 
it seems necessary to institute comparisons are Co)ichopoma,* Ctenodiis,\ and 
tlic recent Ceratodus.% All of these have the continuous median fin, and 
exhibit several striking features of resemblance to the Hawkesbury fish ; but 
a detailed comparison of the new fossil shows that it cannot be comprised in 
either of them. 
The scales of Concliopo)}ia are certainly very similar to those of 
Gosfordia,^ and the absence of traces of teeth in the original of PI. I, Pig. 1, 
suggests that they may have been comparatively small in the Australian lisb, 
as in the European Permian genus. The bead, however, is relatively so 
much less in Gosfordia than in Conchopoma, and the operculum so different 
in shape, that other features, yet to be discovered, will doubtless combine to 
render the generic distinctness of these two forms most marked. 
Clenodiis, and the living fish named Ceratodus, are both separated by 
the large size of the scales ; bmt it still remains to be decided whether or not 
* R. Kner, “ Ueber Conchopoma gadiforme, nov. gen. et spec.,” Sitzungsb. math. Naturw. Cl. k. Akad. 
Wiss., 1868, Vol. Ivii, Pt. i, pp. 278-290, Pis. i-iv. 
t The latest memoir upon this genus is by Anton Fritscli, “ Die Lurclifisclie, Dipnoi,” forming Pt. .'1 of 
Vol. ii of the “ Fauna tier Gaskohle, etc., Bohmens” (1888). 
J A. Gtinther, ‘‘Description of Cemlodu-i,” Phil. Trans., 1871, pp. 511-571, Pla. xxx'-xlii. 
^ The writer has been able to verify this fact by a personal examination of the typc-s^jeciinens of 
Conchopoma in Berlin and Strassl)urg. 
