^66 



ASAJIllO OKA. 



Explanation of Plates. 



0, 1, 2, 8, 4, 5, tentacles, connted from the median line of the body. 



Plate XXXIV. 



Fi(l. J. Distal portion of a polypide cnt open longitudinally, somewhat dia- 

 grammatic. X 140. 



Wet 1, 2, 8, 4. siiow approximately the levels at whieli the cross- 

 sections would appear as represented in Woodcuts 1-4. 

 Red lines with ciphers, at the right hand of the figure, show the 

 levels of figures with corresponding numbers in the same plate. 

 Fitjs. -2-7. Cross sections of the so-called nephridium with neighbouring portions of 

 the polypide. Taken from an individual with an unpaired median 

 anal tentacle, x 500. 



Plate XXXV. 



F'kj. ^'. A ci'oss section, from the same individual as figs. 2-7. x 5Ü0. 



Fujs. 9-11. Cross sections of the so-called nephridium with neighbouring portions of 



the polypide. Taken from an individual without an unpaired median 



anal tentacle, x 500. 

 Fi(ß. Fi-lo. Diagrams showing the relations of varicMis cavities at the distal 



portion of a polypide. 



