ZOOLOGY. 217 
In the Pythonomorpha its character as “suspensorium” of 
the quadrate is still more pro- Tr 
nounced ; yet, though it forms | 
part of a cylindric bar extended 
transversely from the brain-case, 
it maintains asutural union with 2 
the prodtic (see fig. 15, OpO), 
and to a slight degree in Clidas- 
tes, with the supraoccipital, or ae Te 
? epiotic portion of it. If there Fig. 14.—Iguana, from behind. 
be any parieto-quadrate arch (a doubtful point), it probably en- 
ters into it posteriorly. 
In the Ophidia it exhibits an important range of variation. I 
- have not been able to find it in Typhlops* In Cylindrophis it is 
Fig. 15. — Clidastes propython, Cope ; cranium from behind. 
enclosed as usual between the exoccipital behind, the prodtic ante- 
riorly and inferiorly, the pa- 
rietal above, and a small area 
enclosed between the latter 
and the exoccipital, which is 
either the extremity of the 
supraoccipital or a distinct 
element, perhaps  epiotic. 
(See fig. 16: BO, Basioccipi- 
* In an osteological system of the scaled Reptilia, published in “ Proceedings 
-of the Academy of Natural Science,” Phila., 1864, p. 224, an error occurs, in 
A.A. A.S. VOL. XIX. 28 
