284 PROCEEDINGS OF THE CANADIAN INSTITUTE. 
put are capable of considerable movement, so that they may lie almost 
parallel to the longitudinal axis. At the base the bone forms a com- 
plete sheath for the cartilage which supports the maxillary tentacle, 
but this sheath is complete only for a short distance, the cartilage 
lying in a groove in the posterior (inner) surface of the bone. At 
the base are two processes, a smaller posterior dorsal and a larger 
anterior ventral. The latter hasa fascia firmly attached to it in such 
a way that, when the anterior extremity of the palatine is pushed 
forward, it draws the same fascia, and by the tension thus produced 
the maxilla is abducted or pushed away from the sides of the skull. 
The bones possess no teeth. They have in relation to them the pre- 
maaille in front and below ; the palatines behind ; and the adnasals 
on the inner side. 
3. Tue Pauatine, (Pl. II., Fig. 1, Pa.) 
Each palatine is a short, rod-shaped bone, extending antero-posteri- 
orly, parallel with the long axis of the skull. The anterior extrem- 
ity abuts upon the maxilla, and the posterior lies in front and out- 
side of No. 4, and below the antorbital process of the ectethmoid. 
4. (Pl. IL., Figs. 1 & 4). 
This is a small almost round scale-like bone, lying behind and 
within the posterior extremity of the palatine. It is developed in 
the fascia of the anterior fibres of the adductor arcés palatini muscle, 
and cannot be referred to the pterygoid series of bones. In aspeci- 
men of the very closely related Amiwrus nigricans, (LeS) Gill, it was 
quite absent. 
5. MerapreryGorD, (Pl. IL, Fig. 1, JZpt.) 
Is an almost square bone, lying directly behind No. 4. It is flat- 
tened, and its upper posterior border is somewhat concave, aiding in 
the formation of the notch for the passage of the trigeminus to the 
superficial muscles. The anterior superior angle is attached by liga- 
ment to the orbitosphenoids. The bone articulates in front with 
No. 4; behind with the hyomandibular, and below with the guad- 
rate. 
6. THE QuaprateE, (Pl. II., Fig. 1, Qu.) 
Furnishes the articular surface for the mandible. It is triangular 
in shape, thicker behind and below, the upper portion being squa- 
mose. In a deep fossa, on the upper and posterior portion of the 
