﻿328 



CROSSOPTERYGII. 



flanked on either side by a large bone, this series being 

 sivpratemporal according to Traquair's nomenclature 

 (p. 319). A pair of large parietals occurs, with a small 

 squamosal on each side adjoining its hinder half; and 

 the frontals are relatively small, separated by suture, and 

 meeting some polygonal bones in front, but exhibiting no 

 mesial foramen. The bones apparently to be regarded as 

 postfrontals are larger than the frontals and squamosals, 

 and are separated from the latter by the articulation of a 

 large cheek-plate with the parietals. On the lower aspect 

 the right mandibular ramus exhibits infradentary bones ; 



Fig. 49. 



Holoptychius jiemingi, Ag. — Dorsal aspect of head, one-half nat. size. 

 [No. 261176.] 



a slender median, internal bone seems to belong to the 

 hyoid apparatus; and, in addition to portions of the 

 principal jugular plates, a lateral series of jugulars is well 

 preserved on half of the right side. Purchased, 1851. 



37301. Imperfect head and greater portion of trunk of an equally 

 large fish; Dura Den. Purchased, 1863. 



