642 



MEDUS.E OF THK WORLD. 



Fig. 402. — Cassiopea xamachanaf after R. P, Bigclow, in Mem. Boston Soc. Natural History. 



fc, bud growing from side of scyphostoma; cdy circum-oral disk or peristome; (7, inlerrhopalial lobe; //, 

 inlcrrhopalial tentacle; m, mouth; />, proboscis; rhl, rhopalial tentacle; /, trntaclr. 



25, strobila, in which the degeneration of the rhopalial tentacles is nearly complete and the interrhopalial 

 tentacles have begun to degenerate. 26, a complete strobila. The basal polyp bears a bud which 

 broke ofT and swam away while the drawing was being made. The ephyrula was detached during 

 the following night. The rhopalia arc visible through the umbrella. At y is a pair of twin 

 rhopalia (compare y^ fig. 30). 27, basal polyp of same specimen, a few hours after separation of 

 the ephyrula. 18, optical section of same. 29, an ephyrula recently set free; oral aspect, gastric 

 filaments visible through mouth; X 31. 30, specimen of about same age, showing variations of 

 margin at u, uj, y and 2; X 31. 



