69 



showing spherical shape and constricted bell-margin 



Plate IV. 



Fig, 26. 32-tentacled medusa with 14 sense-organs. 7th and 

 Sth tentacles have appeared in each quadrant ex- 

 cept quadrant A, where 8th is lacking. 4 sense- 

 organs have appeared in quadrants E and D , 5 in 

 ijuadrants A and C, 



Fig, 27. Horizontal section of bell-margin at level of ru- 

 diment of tentacle, T.R. Con. calcarious concre- 

 tions; N.R. nerve ring; T tentacle; C.C. circular 

 canal. 



Fig, 28, Tentacle tip of medusa, showing rings of nemato- 

 cysts, angle of tentacle, and adhesive organ on 

 aboral side. 



Fig, 29, Cross-section of adhesive organ, G.C. gland cells 

 composing cement gland; M.F. muscular flange; 

 500/1 drawn by W. K, Brooks. 



Plate V, 

 Fig, 30, Radial transverse section of bell, at point of or- 



