264 



r. H. EDGE WORTH. 



part into the aryteuoideuSj and the ventral part into the 

 thyi'o-avytenoideus and lateral crieo-arjtenoid/' According 

 to Goppert, the crico-arj-tenoideus posticus is the homologue 

 of the dorso-laryngeus of Amphibia, the other intrinsic 

 muscles representing* tlie sphincter and laryngei dorsalis and 

 ventralis of Amphibia. 



Text-fig. 72. 



Text-figs. 72, 73. — Gallus. enil)ryo four days. Text-fig. 72 throiigh 

 the first branchial. Text-fig. 73 tliroiigh the second branchial 

 segment. 



Frazer states that in man the thyroid cartilage is developed 

 solely in the second branchial segment, i. e. it is the second 

 branchial bar only, whereas in Echidna (Goppert) a third 

 branchial bar is also formed. 



The crico-th3^roideus^ according to Frazer, is developed 



