MORPHOLOGY OF CKANIAL MUSCLES IN SOME VERTEBEATES. 233 



and in this paper longitudinal muscles derived from trunk- 

 niyotomes are called " hypobrancliial spinal muscles," and 

 longitudinal muscles derived from branchial myotomes are 

 called " hypobrancliial cranial muscles." 



The Anlagen, which in some Vertebi'ates grow backwards 

 and form coraco-branchiales, are homologous with Anlagen 

 in other Vertebrates, which form muscles passing between 

 the ventral ends of the branchial bars. Many different 



Text-fig 



Rana, emljryo 7 mm.. transverse section. 



names have been given to the latter muscles, e.g. inter- 

 branchiales s. constrictores arcuum branchialium (Bronn), 

 constrictores arcuum (Mivart), interbranchiales (Schultze), 

 subarcuales (Driiner). 



Vetter called certain muscles in the branchial arches of 

 Acipenser ^' interarcuales ventrales," and gave the name of 

 "obliqui ventrales" to exactly homologous muscles in 

 Teleostei. One or other term is superfluous, and following 

 Allis, that or ''obliqui ventrales" is used in this paper for 

 theTeleostomi generally. The name '^interarcuales ventrales" 



