176 EDWARD L. RICE 
to the taenia marginalis. After a short course this cartilage 
band, the taenia parietalis media (fig. 3, t.par.m.), connects 
with one apex of a somewhat extensive triangular plate of carti- 
lage. A second apex of this plate extends downward and toward 
the middle line as a flat band of cartilage and unites with its 
fellow of the opposite side. Thus is formed the subiculum 
infundibuli (figs. 1 and 3, sub.inf.), located just above the anterior 
fusion of the trabeculae, and connected with the septum inter- 
orbitale by means of the cartilago hypochiasmatica (fig. 3, 
c.hyp.) already described. The subiculum infundibuli and the 
anterior portions of the taeniae parietales mediae form on each 
side a nearly semicircular lateroposterior boundary for a large 
opening, the fenestra optica (fig. 3, fen.op.), whose median 
boundary, common to the fenestrae of the two sides, is formed 
by the posterior margin of the septum. 
From the third apex of the triangular plate in which subiculum 
and taenia parietalis media unite, a band of cartilage extends 
backward, continuing nearly the course of the taenia parietalis 
media, but bending slightly upward. Near its posterior end 
(almost in contact with it on one side of the specimen modeled) 
is an isolated plate of cartilage of irregularly triangular form 
(fig. 3, t.par.m’.). 
Of pila accessoria and taenia parietalis media, posterior to the 
subiculum infundibuli, there is no sign in stage 5 of Eumeces, 
unless the rudimentary cartilages just mentioned can be homo- 
logized with some of these structures. The pila prootica is 
reduced to the merest rudiment. In stage 2, on the other hand, 
all of these elements are clearly recognizable. Figure 33 rep- 
resents a graphic reconstruction of the lateral wall of the tem- 
poral region in this stage. In the reconstruction the interpre- 
tation has been liberal, and some parts represented are undoubt- 
edly procartilage rather than true cartilage. Pila accessoria 
(pi.ac.) and pila prootica (pi.pr-ot.) are identically as in Lacerta, 
except for a slight interruption of the pila accessoria on one side, 
not shown in the figure. The taenia parietalis media (t.par.m.) 
extends backward, as in Lacerta, to connect with the pila prootica 
and enclose the fenestra metoptica (fen.m-op.). In Lacerta 
