1902.] NATURAL SCIENCES OF PHILADELPHIA. 781 



positions iu the quadrant relative to the tentacles already present." 

 The next series consists of four tentacles in each quadrant, T.V. 



Fig. 18. 

 to T. VIII. This brings us to the thirty-two-tentacled stage (text- 

 figures 16 and 17). In this it will be seen that T. V follows T. 1, 



Fig. 19. 



T. VI follows T. II, T. VII follows T. Ill, T. VIII follows 

 T. IV, i.e., four numbers intervening in each case. The next 



15 By "series" is not nieaut "cycle," with the idea of simultaneous 

 appearance ; the notion is one of relative position simply. 



