534 PISCMS FISHES. 



The visceral arches are primitively supports for the 



FlG. 280. Under surface of skull and arches of 

 skate. After W. K. Parker. 



J.i, First labial cartilage; R. t rostrum; /r., trabecular 

 region; n.c., nasal capsule; a.o., antorbital cartilage; 

 p.pt.g.y palato-pterygo-quadrate ; M.c. t Meckel's car- 

 tilage; h.m.y hyo-mandibular ; h.br.i-$, hypobran- 

 chials ; c.br.s, fifth ceratobranchial ; c.A. t cerato-hyal; 

 /.2~4, labial cartilages. 



wall of the anterior part of the food canal, but the first two 

 of them are much modified in connection with the jaws. 



