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ANNALS NEW YORK ACADEMY OF SCIENCES 



and swim-bladder, the latter having the "central tendon" directly applied 

 to its dorsal surface. 



The blood-vessels and nerves supplying the drumming muscles are only 



771 S 



VV-S 



Fig. 1. Swim-bladder of Cynoscion regalis. 



The two m. sonifici (m s) are shown laterally displaced, h, head; 1, lateral 

 horn; c t, central tendon of m. sonifici. 



accessory branches from the arteries and nerves of the abdominal muscles. 

 An embryological study of the origin of these accessory blood-vessels and 

 nerves and their relation to the muscle at the time when it is first laid down 



