PLEUROBRACHIA 65 



Reproductive System. — The ctenophore is hermaphroditic 

 and ova and spermatozoa are proliferated from the walls of 

 the meridional vessels. 



A portion of a ctenophoral row should be cut off, and ex- 

 amined under a microscope, to ascertain the arrangement and 

 relation of plates and cilia. 



Make a drawing of a side view. 



Make a diagram that will show the appearance of a mer- 

 idional cross-section. 



Abbott: The Morphology of the Coeloplana. Zool. Jahrb., 24, 1907. 



Agassiz, A.: Embryology of the Ctenophorse. Am. Acad. Arts and 

 Sci., 10, 1874. 



Mayer: Ctenophores of the Atlantic Coast of North America. Car- 

 negie Inst, of Washington, 1912. 



Parker: The Movements of the Swimming-plates in Ctenophores, with 

 Reference to the Theories of Ciliary Metachronism. Jour. Exp. Zool., 

 2, 1905. 



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