Coe and Kunkel— California Limbless Lizard. 369 
pterygoid articulates with the palatine. A short distance posterior 
to the union of the three limbs of the bone there is an articulation 
with a triangular process of the basisphenoid, called by Cope the 
basipterygoid process (2). The ectopterygoid forms a continuation of 
the outer limb of the pterygoid, fits into a notch of the posterior 
portion of the maxilla, and also sends a slender process, which comes 
in contact with the palatine, medially along the posterior margin of 
the maxilla. 
The basisphenoid (4s) is more or less triangular in shape with 
two lateral processes, the basipterygoids, articulating with the 
pterygoids. The lateral, posterior processes of the basisphenoid 
unite with the basioccipital. The basioccipital (60) is large and 
bears a single, simple occipital condyle; in one of Baur’s (’94) 
specimens the sutures between the exoccipitals and _basioccipital, 
which enter into the formation of the condyle, could be distinguished. 
The basioccipital and basisphenoid are not co-ossified. The quad- 
rate (q) is more or less tri-radiate in form; it lies external to the 
stapes (st), the columellar portion of which fits into a slight con- 
cavity on its posterior aspect. The ventral arm lies external to the 
pterygoid. The stapes is large, the tympanic portion thick and 
circular, the columellar portion short and stout. The petrosal, 
according to Cope, lies lateral and posterior to the parietal; the ante- 
rior border is notched to receive the lateral borders of the parietal; 
the supraforaminal portion of the petrosal is produced to an acute 
angle, terminating at the parietal border much in advance of the 
anterior semicircular canal. The body of the petrosal is perforated 
by a large foramen just in front of the superior part of the quad- 
rate. 
The jugal (j) is slender and somewhat curved, free at its distal 
end and united with the maxilla at the posterior facial portion. 
It bounds the orbit of the eye ventrally and posteriorly. The 
squamosal (pl. xu, fig. 6, sg) is small and of irregular shape, flat 
and splint-like. It lies dorsal to the quadrate and stapes and exter- 
nal to the parietal, petrosal, and supraoccipital. The exoccipitals 
are fused with the basi- and supraoccipitals. The lachrymal is very 
small and in connection with the maxilla on the outside, and the pre- 
frontal on the inside. The supraorbital (s) is large and placed above 
the orbit anteriorly. The epipterygoid, mentioned by Cope, is very 
delicate and somewhat L-shaped. I could not determine its position, 
but found it in a thoroughly macerated skull. 
