5^ •> ^c-vf w,. 





jf^ 



'•■K "^ 



1^' ' . 





■7 



V . 



i 



■^y/ 



1, 





' -> 9 





V.--, I f 



V.J;.; • y » e 







Fig 17._ — Aoctduca tniliaris, showing photogenic granules in cytoplasm, n, nucleus; 

 c, cytoplasmic strands containing photogenic (large) and other (small) granules; p, pharynx; 

 f, flagellum; o, oral groove; t, tentacle; s, spines at base of tentacle; v, vacuoles. Drawn by 

 E. B. Harvey. 



