CHONDROCRANIUM OF EUMECES 175 
restricted by Gaupp himself (08 a, 712) to the basal portion, 
processus alaris, of the ala temporalis. There is nothing in my 
work to throw new light on this point, as the form and relations 
of the processus basipterygoideus are essentially identical in 
Lacerta and Eumeces. 
Epipterygoid, articular cartilage, and pterygoid process are 
considered as belonging to the dorsal portion of the first visceral 
arch, and will be further discussed in that connection (p. 200). 
4. Lateral wall of temporal subregion 
The lateral wall of the temporal subregion is reduced to a mere 
latticework, as in Lacerta, but in no single stage examined is 
there any such completeness of this lattice or any such geomet- 
rical regularity in the arrangement of the various fenestrae as 
figured by Gaupp. By the combination of different stages of 
Eumeces it is possible to identify each element of the lateral wall 
of Lacerta, with the single exception of the rather anomalous 
supratrabecula, which Gaupp (’05 b) describes as occurring on 
one or both sides of some specimens of Lacerta. In early stages 
of Eumeces two additional bars of cartilage are found which 
are not mentioned by Gaupp. 
In stage 5 of Eumeces the taenia marginalis (figs. 1 and 38, 
t.marg.) extends without interruption from the uppermost part 
of the otic capsule to the posterolateral margin of the solum 
supraseptale. The union at each end is-a secondary one, as is 
seen by a comparison with stage 2 (fig. 33), in which the develop- 
ing taenia is still unattached both posteriorly and anteriorly. 
For a possible continuation of the taenia marginalis into the 
orbital region, see page 182. In the middle third of its course 
the taenia marginalis makes a great lateral curve (fig. 1), mark- 
ing the widest point in the cranium, as already noted. 
In addition to the taenia marginalis, only the cartilages sur- 
rounding the fenestra optica show a development in stage 5 of 
Eumeces corresponding to that described for Lacerta. From 
the lower posterior corner of the solum supraseptale on each 
side a narrow band of cartilage extends backward, nearly parallel 
