derm of adjacent gastric pouches at the base of an interraciial 

 tentacle. Fig. 34 is laver and here the gelatinous septum 

 completely separates the two pouches. Zeiss. H oc.2. 



Figs. 35 and 36 are from the same series. Fig. 35 is 

 the second section below Fig. 34. It just clears the oesoph- 

 agus. 



Fig. 36 is through the upper part of the stem. Zeiss. 

 DD oc.2. 



Fig. 37. Longitudinal section of a scyphistoma with six- 

 teen tentacles, probably a little younger than Fig. 11. 490. 



Figs. 38 to 44 illustrate the development of the rhopalia. 



Fig. 38. A radial section throi^h the base of an inter- 

 radial tentacle in a fully developed scyphistoma. xH oc.2. 



Fig. 39. A tangential section thraugh the base of another 

 interradial tentacle of the same larva. xH oc.2. 



Fig. 40. A radial section from the base of a rhopalial 

 tentacle somewhat older than Fig. 16. Zeiss K oc.2. 



Fig. 40a. A copy of Goette's Fig. 49, introducea for com- 

 parison. 



Fig. 41. A radial section thi'ough a rhopalial tentacle 

 in the stage of Fig. 17. Zeiss H oc.2. 



Fig. 42. A tangential section of a similar tentacle of 

 the same age in the plane x y of Fig. 41^ Zeiss H oc.2. 



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