BUFFALO SOCIETY OF NATURAL SCIENCES 15 
cast of the interior of this chamber shows that the mucous mem- 
brane was arranged in parallel folds like a rosette. From each 
of these nasal capsules a tube leads backward and, shortly uniting 
with its fellow, passes through the upper portion of the septum 
and opens as a single tube into the uppermost of the posterior 
vacuities before described. I have illustrated on Plate 9, figs. 2, 
3 and 4+, this bone in side and top views. Fig. 1 on the same plate 
shows its relation to the frontals and interfrontal. On Plate 10 
it is seen, together with the prevomers, in ventral or oral view. 
I assume from comparison with the skull of Polypterus and of 
the sturgeon that the uppermost of the two vacuities in this element 
must represent the front part of the brain case. Then, too, the 
pineal opening is directly above its forward termination. As to 
the lower conical pocket I can only doubtfully surmise that it may 
have formed the front end of an eye muscle canal. 

BY 
P.SP. 
L.G. 
pec 
Text fig. 6. Skull of Eusthenopteron foordi, Whiteaves. Transverse 
section of a point near the posterior termination of the frontals. Roofing 
bones of skull are not indicated. Cor., Coronoid; D., Dentary; En. Pi., 
Entoptergoid; E. Pt., Ectopterygoid; L. G. Lateral Gular; M. Pi, 
Metapterygoid; Mx., Maxilla; Par., Parasphenoid; P. G., Principal 
Gular; P. Sp., Posterior Splenial. 
Text fig. 6 is a transverse section of the skull in the region of 
the frontals, largely founded upon a single specimen in which the 
bones were fairly well preserved in their mutual relations. 
I have said that the element, median in the trabecular region, 
