37 



Obelia are laid early in the norning, etschnikoff also 

 Rives the tirr.e of snawninf; of 14 species. 



Regular breeding habits have alsc been found to exist 

 among other r.arine anirr.als, and may be more general than 

 has been suspected. '';ilson in his v/orl: on the develcr-ent 

 of Renill a fo^nd that the eggs of that form were always 

 laid at about 6 A, M. In a single case only, he says, the 

 spawning took Place as early as 5,30 a-^d it was never oi)ser- 

 ved tc occur later then seven o'clock. The relagic Crustaceaij, 

 Lucifer Professor Brocks observed to denosit its eggs at 9 t: 

 10 F. M. 



Bunting lound that by packing Hydractinia in ice and 

 keeping therr at a lower tenPBrature she v;as able to delay 

 the ti'-e of egg lading. On restoring the animals to the nor- 

 aial temperature, the eggs were laid after ?. short period 

 of time. Perkins fcund that the -'ieriodicity of spawning in 

 Gonionema is definitely ^ffected by charges of light. By 

 placing his --edusae in a dark place for an hour and then put- 

 ting the-T: in the daylight apparently normal egg lajring 

 again too'- place. 



