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Charles JV. Hargitt. 



shown at s. e. The hood is also shown at h, not having appar- 

 ently kept pace with the growth of the other organs. Here as 

 before the direct connection of the radial canal with the rho- 

 palium is quite broad and characteristic. The middle lamella, or 

 mesogloea, is shown at mgl. above and below, in the latter ele- 

 ments of a loose network being traceable, with the embedded cells, 

 which can also be found indefinitely scattered throughout the jelly. 

 In Figure 6 we have a section through an almost mature rho- 

 palium, taken in the same plane as the others, only the organ 



n.f s.e. 



ect 



Fig. 6. 

 Section of regenerated rhopalium, approaching maturity. It, lithocysts ; nf, 

 nerve fibers ; other letters as in Figs. 2 and 5. 



itself with the terminus of the hood being shown. The ectoderm 

 has become practically uniform over the entire distal portion of 

 the organ, but as it approaches the base of the area of the litho- 

 cysts, shown at It. and generally throughout the entire distal part, 

 it becomes columnar. At 5. e. it forms a definitely arched por- 

 tion, the sensory epithelmm, beneath which at n. f. is the so-called 

 nerve fiber area of the nerve center of this region. While it Is 

 quite possible to distinguish a more or less fibrous character as 



