SECTION THEOUGH PHARYNX. 



205 



of a single layer of very long and slender flagellate 

 cells, resting on a thin outer wall of connective 

 tissue. 



The atrial cavity has the same general relations as in 

 section B. The atrial epithelium covers the outer 

 surfaces of the branchial bars, and the suspensory 



H' S G 



Fig. 42 Amphiozus.^lanceolatus. 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 indicated 

 by a thick black line. (a. m. m.) 



A, skeleton of dorsal fin. B, spinal cord. C, notochord. D, connective- 

 tissue sheath of notochord. E, cavity of pharynx. F, epibranchial groove. 

 G, endostyle. H, atrial cavity. L, liver. M, dorsal ccelomic canal. 

 K", branchial ctnlomic canal. O, ccelomic space surrounding liver. OV, 

 ovary. P, metapleural icanal. R, left dorsal aorta. S, endostylar ccelomic 

 canal. T, hepatic veins. 



