350 



TELEOSTEI 



slides backwards and forwards over the ethmoid, the maxilla being 

 pushed forward by the palatine (Figs. 333, 441). An accessory 



Fio. 331. 

 Albula conorhynchus, B. and S. (From Ridewood, Proc. Zool. Soc.) Dorsal view of the 



and fifth basi branchial s fused and covered with small dentigerous plate ; gh, thin bony plate 

 covering the basihyal (glossohyal) ; hb '*, third hypobranchial ; hh, hypohyal ; pb 1 and pb 3 , first 

 and third pharyngobranchials. 



masticating apparatus is often developed on the branchial arches 

 (Fig. 460). 



The median urohyal, attached in front to the hypohyals and 



FIG. 332. 

 Erythrichthys nitidns, Rich. (After Gunther.) 



passing back between the sternohyoid muscles, is quite peculiar to 

 the Teleostei (Figs. 303, 358) ; similar but paired bones occur in 

 Polypterus. 



