osTEOLoay of clupeoid fishes. 



465 



1904.] 



two depressions, bounded externall}^ by the epiotics. The epiotic 

 has on its postero-superior surface a large, oval, smooth facet 

 for articulation with the post-temporal ; and from the apex of the 

 epiotic there projects backward into the muscles of the trunk a 

 separable osseous brush. A similar brush projects back from the 

 apex of the supraoccipital, which has no crest or spine. 



The parasphenoid extends very nearly to the posterior end of 

 the basioccipital, and although the right and left sides of the 

 posterior outlet of the eye-muscle canal are formed by vertical 

 laminfe of the parasphenoid, there are no projecting posterior 

 wings of this bone. The middle portion of the parasphenoid 

 bears a sharp ventral keel. Neither parasphenoid nor vomer 

 bears teeth. A small basisphenoid is present, but it has _ no 

 descending portion bisecting the eye-muscle canal. The orbito- 

 sphenoid is fairly large, and has a forwardly directed process that 

 meets a backward "growth of the combined prefrontals. A 

 f ontanelle is present in the roof of the skull between the mesethmoid 

 and the frontals. 



opcu 



pmy 



d 



snv 



sop 



pop 



icp cor 



Chatoessus erehi, right side of sknll. For explanation of lettering see p. 493. 



Temjjoral and Preopercular Series (text-fig. 127). — The post- 

 temporal is large, and the attachment of its upper limb to the 

 postero-superior surface of the epiotic is quite intimate, and not 

 by means of a broad loose ligament. The deep limb is rod-like 

 and is attached to the back of the opisthotic. The third limb is 



Proc. Zool. Soc— 1904, Vol. II. No. XXX. 30 



