346 BONES OF LO@PHIUS PISCATORIUS — MORROW. 
of the quadrates. They are very thin narrow plates, single at 
their posterior edges and nearly smooth on their outer surfaces, 
with an irregular outline. On their under surfaces, at their 
superior extremities, they have short ridges nearly in their cen- 
tres, extending downwards about one-third of their length. 
Against these ridges rest the stylohyals, which are at their upper 
extremities attached to grooves in the hyomandibulars. 
34. The dentaries are long and narrow; at their anterior ex- 
tremities they are united by symphysis, and support two rows of 
teeth upon their inner surfaces, one of full size, and the other in 
various stages of growth; on their lower anterior extremities 
there are processes for muscular attachment, and on their pos- 
terior inner surfaces is the space for Meckel’s cartilage. 
35. The articularies fit into the spaces or grooves of the den- 
taries. On their upper surfaces the superior anterior faces join 
the dentaries in sharp points and widen posteriorly to a consid- 
erable breadth ; at nearly their superior posterior outer edges each 
has a projecting spine, and on the inner inferior edge processes 
for connection by ligament with the quadrates ; immediately 
posterior to the spines is the articulation for the condyle of the 
quadrates. The heads or posterior extremities of these bones 
extend about one and a quarter inches beyond the anterior edge 
of the articulation, and upon them rest the spine and the supe- 
rior part of the broad inferior extremity of the quadrates. From 
the superior posterior extremities of the dentaries the posterior 
extremities of the articularies reaching to the anterior edge of the 
articulation for the condyles of the quadrates rapidly fall, and 
form a triangular surface, which appears to be for the attachment 
and play of the maxillaries. 
36. The angulars are exceedingly small and thin flat bones, 
situated on the inner sides of the posterior extremites of the arti- 
cularies. They have small heads, which are turned outwardly 
and overlap the articularies. 
29. Stylohyals. These bones, as already mentioned, lie in 
grooves in the hyomandibulars, and are small and somewhat 
tapering towards their superior extremities and have a ligament- 
ous attachment. 
