4 ON THE STRUCTURE OF EUSTHENOPTERON 
enac Bay, Quebec, contain a typical assemblage of fishes of the 
period for the most part in a good state of preservation; and in 
1914 I visited that locality and made large collections. Subse- 
quently two other collections were acquired by purchase, and Dr. 
John M. Clarke, Director of the State Museum, kindly placeé 
at my disposal the State’s very extensive series of fishes from the 
same locality, numbering many hundred individuals. I also vis- 
ited the museums of London, Edinburgh, Montreal and Quebec 
for the purpose of studying their collections. 
While the fossil fishes of Scaumenac Bay are usually much 
crushed, they are often found entire and the larger ones can some- 
times be sectioned and worked out in such a way as to display their 
skeletal anatomy to better advantage than can the fossil fishes of 
the same age from any other locality of which | am aware. For 
instance, it is only recently through the researches of Watson and 
Day that anything has been learned of the internal skeleton of 
the head of the so-called Crossopterygian fishes of England. 
Vhat little hardly prepared me for the remarkable conditions 
found in Eusthenopteron. 
Modern research points to the Crossopterygii as being more 
nearly related to the projenitors of the air-breathing vertebrates 
than were the lung fishes; and on account of the morphological 
interest of this family I have made my studies of Eusthenopteron 
as elaborate as possible. 
More than one author, including the late Dr. Whiteaves, the 
discoverer of Eusthenopteron foordi, has published restorations 
of this fish. The best of these appeared in Ray Lankester’s 
“Guide to the Gallery of Fishes of the British Museum” in 1908. 
All of them, however, give inaccurate representations of its pro- 
portions, as they show the fish as though it was crushed flat, mak- 
ing it appear altogether too deep in proportion to its length. 
Eusthenopteron (Text fig. 1 and Plate 1, fig. 1) was a rather 
slender, round-bodied fish resembling in its proportions Osteo- 
lepis rather than Holeptychius. That it was an active, voracious 
