118 UPPER CRETACEOUS TELEOSTS 
and well ossified. The medial groove containing the symplectic is broad and deep 
and ends just postero-dorsal to the condylar region. The posterior edge of the 
quadrate lies in a groove on the antero-ventral edge of the preoperculum and is over- 
lapped laterally and medially by the preoperculum. Anteriorly the quadrate is 
rigidly attached to the postero-medial face of the ectopterygoid. 
The ectopterygoid is in two portions joined ventrally, giving a V-shaped dorsal 
trough between the two components. The ventral edge of the bone is curved and 
bears teeth. The more posterior teeth are not strictly on the ventral edge of the 
bone but their bases have moved upwards on to the lateral face of the ectopterygoid. 
The teeth, however, form a continuous series and are acute, laterally compressed, 
and hollow. The tooth size decreases towards the posterior end of the bone. All of 
the teeth have the same angular relation to the supporting bone, i.e. at go° to it. 
Therefore the more posterior teeth are directed forwards due to the postero-ventral 
curvature of the ectopterygoid. All of the teeth are marked by fine longitudinal 
striations and the bases are expanded and ornamented with small pits and fine striae. 
The ectopterygoid contacts the postero-ventral surface of the palatine and extends 
along the medial surface of the latter bone. The palatine thus sits in the groove on 
the dorsal surface of the ectopterygoid. The medial flange of the ectopterygoid is 
hm.h 
pop 
f.l.e 
hm VII de f_mes.vo 
10mm 
Fic. 53. Eurypholis pulchellus (Woodward). Hyopalatine and opercular bones and 
mandible of the left side in medial view. From B.M.N.H. number P.10984. 
