GIGANTOCYPRIS MULLERI 



Fig. 12. Same reconstruction as in Fig. 1 1 but from the sagittal plane showing aorta and nerve ring accurately 

 bisected and complete visceral nervous system, ao.g. aortic ganglion; ao.t. aortic tendon; ap. apodeme 

 supporting nauplius eye muscle; c.v.b. connexion between visceral system (labral loop) and brain ;fr.a. frontal 

 apodeme ; fr.o. frontal organ; g.lab. labral ganglion ; g.st. stomach ganglion; La. labral artery; m.ao. aortic 

 muscle; m.n.e. nauplius eye muscle; m.pc.d. pericardial dilator; n.fr.o. nerve to frontal organ; n.n.e. nerve to 

 median component of nauplius eye; v. valve in supraneural blood vessel. 



In the posterior wall of the aorta lies the pericardial dilator muscle. This extends 

 from the pericardial floor down to a tendinous plate in the aortic wall just above the 

 level where the aorta bifurcates. This plate, the aortic tendon, marks the point of 

 attachment of various muscles and is itself connected to the ectoderm through the 

 frontal apodeme (Fig. 12). The muscles are the anterior and posterior aortic-oesophageal 

 muscles and the aortic endosternite muscle all running ventrally, while the aortic 



