PLATE II. 



Page 

 Fig. 1. TUBTTLARIA INDIVISA 99 



Fig. 2. EUDENDRIUM RAMOS. a,6,c,d. Development 

 of " Pyrulum." e. Planulae. /. Germ-cap- 

 sules, g. Young Polyp 106 



Fig. 3. HYDRACTINIA SQUAMATA 115 



Fig. 4. SERTTJLARIA ARGENTEA 122 



Fig. 5. CAMPANULARIA DICHOTOMA. a. Reproductive 

 vesicles. 6. Reproductive vesicle giving 

 birth to a young Medusa; represented at 

 c and d as it appears after its liberation . . 130 



Fig. 6. SERTTJLARIA POLYZONTAS. a. Cells with ex- 

 panded Hydra, b. Reproductive vesicle, the 

 contents of which are seen escaping at d. 

 c. Planulse. e, f, g. Development of young 

 Polyp 125 



