26 
nent ‘ post-glenoid”’ process. The bone is stoutest at 
this region, but becomes gradually lamelliform forwards, 
and its anterior margin is furcate—the lower limb fitting 
into the cavity of the dentary. The quadrate facet is 
cartilaginous. ‘The outer face of the articular is convex, 
the inner concave. 
Angular (An.)—A small but perfectly distinct bone 
situated at the postero-inferior angle of the articular. 
Meckel's Cartilage. —A long thin rod ef cartilage 
embedded in the articular behind, but lying quite freely 
for the greater part of its length. It is situated near and 
parallel to the ventral border of the inner or concave face 
of the articular and projects shghtly beyond the anterior 
extremity of the ventral limb of the latter, the free end not 
being ossified as a mentomeckelian as in Ama. The free 
portion of Meckel’s cartilage was 12mm. long in the speci- 
men now described, and in a very large fish it attains a 
diameter of about 2mm. 
Dentary (V.).—A thin bone, but well ossified at its 
dorsal and ventra! borders and strongly attached to the 
dentary of the other side. It is strongly and almost 
equally forked behind, and contains a large triangular 
cavity for the reception of the lower hmb ef the articular. 
Like the latter, its outer face is convex and the inner 
concave. Quite near the symphysis it on this side and in 
this specimen bore 3 teeth, opposite to which on the ven- 
tral border a prominent process was set down. In a very 
large specimen examined there were no teeth cn this side, 
their position being occupied by a roughened ridge. 
Maxilla (J/w.). 
club-shaped bone, the expanded lower extremity of the 
Takes no part in the gape. A stout 
handle or shaft of which overlaps the lower jaw externally 
at about the junction of the articular and dentary when 
the mouth is closed. The shaft narrows down before ex- 
