368 Coe and Kunkel— California Limbless Lizard. 
the postfrontal. The frontals (/r) are large and separate. They are 
slightly separated posteriorly by an entrant angle of the fused 
parietals. Laterally are situated the prefrontal and postfrontal. 
The descending processes meet ventrally, enclosing the olfactory 
lobes. The parietals (pa) are fused and very large. There is no 
pineal foramen, but near the anterior margin is a cavity on the under 
side in which lies the pineal eye as has been described for Anguwis. 
The parietal broadens posteriorly, although just behind the coronal 
suture it is constricted sharply so that the lateral angles overhang. 
Posteriorly the two lateral portions are prolonged considerably to 
fit externally to the supraoccipital ; in the median portion of the 
posterior edge of the parietal are several slender teeth for gomphosis 
with the supraoccipital (so). In one specimen there were four, as 
figured, but in others the lateral teeth had disappeared. Near the 
middle of the suture with the supraoccipital are two oval depressions. 
A short process of the outer and posterior end of the parietal rests 
on the petrosal and supports the anterior end of the squamosal. 
The parietal is in contact with the frontals, postfrontals, petrosals, 
squamosals, and supraoccipital. 
The supraoecipital (so) is large and is fused with the exoccipitals. 
There is a deep notch at the posterior margin dorsal to the foramen 
magnum, This bone is expanded considerably to accommodate the 
anterior semicircular canal. In each internal ear: there is a single 
large lenticular mass of very white carbonate of lime, the otolith. 
The horizontal semicircular canal extends around the otolith medially 
and very nearly meets its fellow in the middle line. 
The vomers (fig. 5, vo) are separated anteriorly by the median 
process of the premaxilla. They are in contact with each other for 
about one half of their length but are separated posteriorly. The 
maxille and palatines lie externally to the vomers, immediately 
behind which the posterior nares open. There is a strongly devel- 
oped longitudinal keel on each vomer which becomes more promi- 
nent posteriorly, and a foramen in the middle of each. 
The palatines (p/) are separated widely from each other by the 
yomers and are in contact also with the maxille, ectopterygoids, 
pterygoids, and prefrontals; they are short and, with the ectoptery- 
goids, enclose the anterior halves of the palatine foramina. Each 
pterygoid (pé) is long and Y-shaped and encloses the palatine fora- 
men posteriorly. The outer limb of the Y is united with the ecto- 
pterygoid (ec) by a transverse suture; the posterior limb is the longest 
and extends medially to the quadrate. The median limb of the 
