252 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 92 
the anterior margin thin and emarginated. There is only one emargi- 
nation, but since the proscapular process is missing, its full extent 
cannot be positively determined. 
On the external surface a strong rounded ridge is developed imme- 
diately above the glenoid border and extends diagonally upward to 
the middle of the upper end, terminating in a raised end short of 
the upper border. The glenoid end is much thickened, having a 
greatest transverse width of 8mm. In this specimen the coracoscapular 
articulation is so fully fused that all trace of their union has been 
obliterated. In the scapula-coracoid of U.S.N.M. No. 15568, however, 
this suture is indicated as continuing nearly 
straight through from the glenoid fossa to 
Me ofi; 
Sse 
han ns 
il ) > the anterior edge of the scapula above the pro- 
N\i/f/ yy 
ia 
lf 
i coracoid process, ending at the base of the 
} scapula-coracoid fenestra. 
The coracoid is complete in U.S.N.M. No. 
15559, as shown in figure 27. The coracoid 
has a single fenestra, as contrasted with two 
in most members of the Iguanidae. Between 
the posterior border of this fenestra and the 
glenoid fossa the bone is perforated by a large 
coracoid foramen. The proglenoid process is 
thickened and rounded. The ventral border 
forms a long, sweeping, convex curve. The 
coalesced coracoid and scapula have a greatest 
length over all of 68 mm.; the upper end of 
the scapula has a greatest anteroposterior di- 
ameter of 14.5 mm.; greatest anterior poste- 
rior diameter of the coracoid is 31 mm. 
The presence of a single emargination in 
ula-coracoid of Polygly- 
phanodon sternbergi Gil- 
more, U.S.N.M. No. 
15559, natural size, lat- 
eral view: co, Coracoid; 
gc, glenoid fossa; sc, 
scapula; ssc, fragment 
of the proscapula. 
the coracoid suggests relationship with the 
Agamidae, which generally have but one, U’7o- 
mastrix being an exception. However, little 
dependence as to relationship can be placed 
on this feature, for, as pointed out above, most Iguanidae have double 
coracoidal emarginations. Yet here again there as exceptions, for 
in the terrestrial genera Urocentrum, Sceloporus, and Phrynosoma, 
and in the Anolidae, there is but one. Usually these emarginations 
are enclosed anteriorly by the cartilaginous coracoidal and scapular 
borders; sometimes they are simply open emarginations. 
Clavicle——Clavicle bones are present in five individuals of the pres- 
ent collection, but only two, U.S.N.M. Nos. 15816 and 15818, have the 
expanded perforate, lower ends preserved. The description to fol- 
low is based on the left clavicle of the paratype, U.S.N.M. No, 15816, 
which is preserved in nearly its normal articulated position. 
