a2 EDWARD PHELPS ALLIS, JR. 
The fold of the secondary upper lip, thus well developed in its 
posterior portion, probably extended forward far enough to fall 
into its fellow of the opposite side on the anterior end of the 
snout, but it was probably not there completely differentiated 
from the primary lip. Because of this failure to there be com- 
pletely differentiated, no premaxillary bone has been developed, 
and the maxillary splint has been prolonged anteriorly to replace 
it. This latter bone is a superficial one, and, as it extends into 
the oral edge of the secondary lip, it is quite certainly an holos- 
tean maxillary. The attachment of a maxillary bone to the 
ventrolateral edge of the palatoquadrate thus does not, in itself, 
necessarily imply that the bone is the homologue of the maxillary 
of Polypterus. 
A so-called vomer is found in this fish, but it les wholly an- 
terior to the buccal cavity, on the ventral surface of the long 
spatula-shaped snout. This bone thus actually lies external to 
the primary lip, and if it actually be a vomer, its anomolous 
position needs explanation. 
TELEOSTEI 
In these fishes the labial folds and furrows vary greatly, some- 
times resembling those in Amia and sometimes those in Polyp- 
terus, but usually differing, in certain details, from those in 
either of those fishes. In Esox, for example, there is a maxillary 
labial fold and a mandibular labial flap that are apparently 
similar to those in Amia, but the supralabial furrow lies ata 
certain distance dorsal to the labial fold and is definitely a sub- 
lachrymal furrow, the dorsal edge of the labial fold being bounded 
by an anterior prolongation of the postlabial furrow. This thus 
suggests, as does the development of these furrows in Amia, that 
the supralabial furrow is primarily a sublachrymal one, and only 
secondarily comes to bound the dorsal edge of the labial fold. 
In Gadus the labial fold is a maxillomandibular one, as in 
Polypterus and Acanthias, but there is a suprapremaxillary fur- 
row which lies between the premaxillary and maxillary bones 
and is continued anteriorly until it falls into the anterior end of 
its fellow of the opposite side on the anterior end of the snout. 
