128 J. Hi. LEES 
in front of the fossa to form part of its anterior margin. ‘This wing 
of the jugal tapers upward until at its union with the postorbital, 
which passes down to complete the margin of the fossa, it forms 
with the postorbital a narrow bar of about one-fourth inch width 
separating the fossa and the orbit. The jugal also forms part of the 
lower boundary of the orbit and here unites with the lachrymal. — Its 
anterior limit and its union with the maxilla cannot be determined; 
the probable relations have already been discussed in connection 
with the maxilla. 
Postjrontal.—The postfrontal is a short, irregular, subquadran- 
gular bone lying in the angle formed by the frontal and parietal, with 
which it unites by oblique sutures. It forms the posterior part of 
the upper margin of the orbit and laterally unites with the postorbital, 
a long, rather slender, quite irregular bone whose anterior extremity 
enters into the slender arch between the orbit and the lateral temporal 
fossa, and the posterior extremity into the robust bar between the 
supra- and lateral temporal fosse. This latter bar is completed 
posteriorly by the squamosal, with which the postorbital unites by a 
broad, overlapping suture. It has a width of about three-fourths of 
one inch. 
Squamosal.—The squamosal has an exceedingly irregular out- 
line owing to its relations both with other bones and with the open- 
ings located in this part of the skull. Its anterior margin is incised 
by both the lateral and supra-temporal fossee, which divide this part 
of the bone into three parts. The inner portion forms the proximal 
margin of the supra-temporal fossa along nearly one-half its length, 
and unites with the parietal as described in discussing that bone. 
The central part enters into the arch between the two fosse, as stated 
above, while the outer portion extends as a long, gradually tapering 
wing forming the posterior margin of the lateral temporal fossa along 
nearly the entire length of that opening. This portion unites along 
its inferior edge with the quadratojugal and the quadrate in a long, 
oblique, crescentic, squamous suture. The posterior part of the 
squamosal borders the posterior half of the large median notch, 
and forms the rear part of the skull for about one and one-half inches 
of its width and is then deflected vertically downward to outline the 
inner border of a small, narrow, obliquely directed notch which pene- 
