212 



F. H. EDGE WORTH. 



cartilage dorsal to the intermandibularis posterior. A similar 

 muscle is formed in Salmo ; it grows forward ventral to the 

 inter-mandibularis. In 9i mm. embryos of Lepidosteus and 

 9 mm. embryos of Acipenser (Text-fig. 22 a) a similar Anlage 

 is formed from the dorsal edge of the hyoidens inferior or Cs. 

 and develops into the hyomaxillaris ligament.^ In Polypterus^ 

 ? species, Pollard described, but did not name, a small muscle 



Text-fig. 40. 



P>**n<vrt<L 4«] 



lnj\niL n 



^^ZS^ III 40. 



Text-fii;. iO. — Ceratodiis, stnge 40, longitudinal horizontal section. 



" at the angle of the jaw in the substance of the ligament 

 which binds the hyomandibula quadrate and stylohyal," 

 innervated by the opercular branch of the hyoid branch of 

 the Vllth. In Polypterus senegalus only a ligament is 

 present. 



In Ceratodus, between the stages of 38 and 40, the hyoid 

 myotome and interhyoideus spread backward in the opercular 



' Man<lil)ulo-hyoid ligament (if van Wijlie. 



