BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
PLATE IX. 
To illustrate the irregular development of the marginal tentacles belonging to 
the ti, £5, and ts cycles. 
Figs. 1-6, 10, and 14 are normal sectors belonging to the third stage of development. 
Figs. 7-9, 12, 13, 16-19, and 22-26 show sectors belonging to the same stage of de- 
velopment, but there has been great irregularity in the succession and 
growth of the third cycle of tentacles. 
Figs. 20-22, 27, and 28 show sectors with only one tentacle of the tg cycle in each 
primary division. 
Figs. 29 and 30 belong to the second stage of development . 
