Devonian Fishes of Campbelltown and Seaumenac Bay. 121 
wanting the head it is true, but which originally must have 
been over 2 feet in length, it is also shown that a third 
and additional set of ossicular fin-supports followed on the 
second, though they are ordinarily concealed by the bases of 
the fin-rays. 
Classification.— Although the Dipnoan affinities of Phanero- 
pleuron were certainly indicated by Huxley in his “ Essay on 
the Classification of the Devonian Fishes,” he placed the 
genus among the Crossopterygii in a distinct family of 
“ Phaneropleurini” which he thus defined :— 
“ Dorsal fin single, very long, not subdivided, supported 
by many interspinous bones, scales thin cycloidal, teeth 
conical; ventral fins very long, acutely lobate.” 
To this family I afterwards added the Carboniferous 
Uronemus, but the cranial structure and dentition of both 
genera were then very imperfectly known. 
Cope was, I believe, the first who boldly relegated Phanero- 
pleuron to the Dipnoi; but the thing was beyond all doubt 
when Whiteaves showed that his Phaneroplewron curtum was 
possessed of a ctenodont dentition and an arrangement of 
cranial plates resembling that in Dzipterus. That the same 
points hold good for Phaneroplewron Andersoni there cannot 
be any doubt, and as for the conical marginal teeth, described 
by Huxley, I have satisfied myself that they are merely the 
outer denticles of ctenodont plates. Whiteaves’s statement 
that in Scaumenacia curta “both the upper and under jaw 
are armed with smooth conical and somewhat compressed 
teeth,’ I have never been able to confirm —at least if 
“marginal teeth” are hereby meant. Consequently, putting 
aside the older but less suitable name of Ctenododipterini 
(Pander and Huxley), I proposed the family term Ctenodon- 
tides for Phaneropleuron, Ctenodus, and Dipterus, but not tor 
Uronemus. 
For I had already in 1882 shown that the dentition of Gano- 
pristodus splendens, Traq., which I afterwards merged in 
Uronemus, was NOT ctenodont, but that on the other hand 
the anterior part of the palatopterygoid bone, broad and flat, 
is covered merely by small rounded tubercles, while along 
the outer margin is one row of laterally compressed, basally 
