IG PROCEEDINGS OF THE CANADIAN INSTITUTE. 
The maxille are specialized for the support of the long maxillary 
tentacles. Instead of developing parallel to the axis of the skull, 
they extend outwards at right angles to it, their antero-posterior 
extent beimg very much diminished. They have, in fact, lost all 
the usual relations to the gape. That they do not possess teeth 
is not remarkable, since even in Hsox they are toothless, though 
probably their origin was similar to that of the intermaxille, 7.¢., 
the union of cement plates. The fact of their being moved by a 
special muscle lying below the adductor mandibule, instead of by the 
upper layer of that muscle, and also their relation to a nerve aris- 
ing from the trigeminus before its division into the superior and 
inferior branches, which seemed to indicate for them an angular 
nature, gave rise to a passing idea that they might not really be 
homologous with the maxille of other Teleosts, and I was inclined 
for a time to compare them to the supramaxillaries described by 
Gegenbaur as occurring in Alepocephalus and Clupea’. These pecu- 
liarities, however, do not properly belong to the bones but to the 
tentacle, and, since the relations of the bones are the same as those 
of the maxilla of other Teleosts, and their mode of development 
similar, there seem to be no reasons for departing from the usual 
idea that they are homologous with the maxille of other osseous 
fishes. 
The palatine bears no teeth. The first trace of bone is formed by 
the perichondral investment of the ethmo-palatine cartilage, this 
osseous layer having similar histological characters to the cement 
plates, there being evidently a close relation between these two 
forms of bone. 
The true pterygoids are all so-called cartilage bones, and therefore 
the bone described as No. 4 cannot belong to the series. Its true 
relations have already been indicated. The presence of only one 
pterygoid is, however, a peculiar feature. In the youngest stage 
which I was able to study, ossification had just commenced, and by 
means of sections? it was seen that the anterior portion of the 
metapterygoid contained no cartilage, there being thus, apparently, 
an interval between the anterior extremity of the pterygo-quadrate 
1 Loe, cit. 
21 must testify to the good results obtained by the use of asaturated watery solution of Bis- 
marck Brown. Not only are cartilage and bone admirably differentiated, but also muscle, 
nerve, glandular tissue, etc. 
