BUFFALO SOCIETY OF NATURAL SCIENCES 19 
we have in the base of the skull of this remarkable fish a median 
ventral opening in the region of the hypophysis and whether we 
have here vestiges of a former connection between the pharynx 
and the base of the brain, and all that this might imply in rela- 
tion to the derivation of the vertebrates. 
On account of the extremely interesting structure of the pec- 
toral fin of Eusthenopteron it has often been figured by authors 
who have found in it more than a suggestion that the amphibian 
limb originated from a somewhat less specialized ancestor of the 
Crossopterygians. The best of these illustrations are those pub- 
lished by Broom (1913) and Petronievics (1918). I can add 
something to our knowledge of this fin for there is in the Museum 
of the Buffalo Society a specimen which I illustrate on Plate 14, 
fig 1, and which exhibits a nearly complete shoulder girdle with 
the scapulo-coracoid very much in its natural position; and as 
the scapular element has never before been found in Crossop- 
terygian fishes I give in Text fig. 7 a drawing of the pectoral 

Text fig. 7. Eusthenopteron foordi, Whiteaves. Right pectoral limb, 
medial aspect. Co. Sc., Coracoscapula; Cl., Cleithrum; C@v., Clavicle; H., 
Humerus (basal piece of mixopterygium); R., Radius; Se., Scapula; 
S. Cl., Supracleithrum; U., Ulna. 
girdle with the fin elements attached. The supra-clayicle is a 
ta 
