1904.] 



OSTEOLOGY OF CLUPEOID PISHES. 



481 



strongly marked backward slope ; the opercular and subopercular 

 bones are of average size, and take no share in that enlargement 

 which is so marked in the bones of the mouth. There are eleven 

 bi-anchiostegal rays on each side. The first is attached at the 

 front of the ceratohyal, the ninth at the junction of the ceratohyal 

 and epihyal, and the remaining two on the epihyal. They are 

 all curved rods except the last two, which are somewhat 

 lamellate. 



Text-fig. 138. 



^y-. 



or 



ecp 



''d 



Coilia nasus, hyopalatine ai'cli and mandible of left side, mesial aspect : hm', head 

 of hyomandibular articulating with the cranium. For explanation of other 

 lettering see p. 493. 



Text-fig. 139. 



Coilia Mffs?/s,hyobranchial skeleton, dorsal view, 

 hranchials of the right side are not shown, 

 p. 493. 



The epibranchials and pharyngo- 

 For explanation of lettering see 



Hyohranchial Series (text-fig. 139). — The interhyal is a long, 

 rod-like bone. There are two hypohyals, the upper one small 

 and situated antero- superiorly to the lower, which alone is in 



Proc. Zool. Soc— 1904, Yol. II. No. XXXI. 31 



