450 ALLIES. [Vor. XIV. 
may possibly become the vomer bone of man, as will again be 
referred to below. 
The premaxillary (PJZX) of Amia consists, as Bridge has 
stated (No. 7, p. 610), of two parts, —a thickened, anterior, 
marginal portion, and a spoon-shaped, posterior portion, the 
latter being called by Bridge the ascending portion of the bone. 
The marginal portion bears several large teeth, usually eight in 
number, and has a roughened median end where it adjoins, 
and is bound by fibrous tissue to, its fellow of the opposite side. 
The posterior portion of the bone arises, approximately, from the 
mesial two-thirds of the marginal portion, and it is perforated 
in the center for the passage of the olfactory nerve. It lies 
directly upon the floor and sides of the nasal pit, those surfaces 
of the pit being formed by the dorsal surface of the septo- 
maxillary and the dorsal surface of the chondrocranium around 
and posterior to that bone. The hind end of the bone becomes 
thin and extends backward under the frontal, in some speci- 
mens as far as, or even slightly beyond, the hind end of the 
preorbital ossification. This part of the bone lies ventral to 
that thin anterior process that arises from the mesial end 
of the anterior edge of the frontal, but dorsal to the similar 
process that arises from the lateral end of the anterior edge of 
the bone. 
At the extreme antero-mesial end of the large olfactory per- 
foration of the posterior process of the premaxillary there was, 
in all the specimens first examined, a partly formed foramen, 
which transmitted, from below upward, a terminal branch of 
the ramus palatinus anterior facialis (No. 3, p. 620, and Figs. 
8, 10, and 21). This nerve, immediately after issuing from its 
foramen, anastomosed with terminal branches of the ramus 
maxillaris superior trigemini, and one or more branches of the 
plexus so formed, accompanied by vessels, immediately entered 
one or more small foramina which lay immediately in front of 
the first-mentioned foramen, and led into canals in the pre- 
maxillary bone. In the specimen from which the present 
drawings are made, a relatively young one, the partly formed, 
first-mentioned foramen was found as a fully formed one 
(paffr., Figs. 2-4), and the canal leading downward from it 
