SECTION THEOUGH PHARYNX 



189 



The atrial cavity has the same general relations as in 

 B. The atrial epithelium covers the outer surfaces 

 of the branchial bars, and the suspensory folds of 

 . the pharynx; and is continued downwards along 

 the inner surfaces of the atrial folds, covering the 

 reproductive organs, and being thrown into folds 



Fia. 33. — AmpUoznB lanceolatns. Transverse section through the 

 hinder part of the pharynx of an adult female, passing through the 

 liver and ovaries. The boundary of the atrial cavity is incUcated 

 bya thick black line. (a. u. m.) 



A, skeleton of dorsal fin. B, spinal coid. G, notocliord. J3, connective- 

 tissue sheath of notochord. B, cavity of pharynx. F, hyperbranchial 

 groove. G, hypobranchial groove. H, atrial cavity. Xi, Uver. M, dorsal 

 coelomic canal. N, branchial coelomic canal, O, ccelomic space sniroanding 

 Uver. OV, ovary. F, metapleural coelomic canal. B, left dorsal aorta. 

 S) cardiac aoit^. 1, hepatic veins. 



