38 



'..hile I did not try ex::eriments on Turrito^sis olther 

 with regard to temnerature or light, yet the changes of tem- 

 oprature from day to day had no noticeable effect on the time 

 at which they discharged their eggs, that ic, it occured at 

 thf sare hour or. warr days and cool, days. I^"" H^'b ^anner 

 the fact that the aquarium in v/hich the niedusae were contain- 

 ed was keDt before a lighted lamn all night had no effect, 

 on the tir.e of srav;ning the next r.orning, which took -nlace 

 at the fixed oeriod, 



THE EGG. 



The egg of Tur r itonsis is spherical and *» devoid of 

 a -ex.brane when first laid and none is subsecuently forned. 

 In size it is auito sn^all and can easily he oyorlool;ed. If 

 the water is free fro:^ sodirent and the dish containing the 

 eggs is placed upon a n)ace d)f black paner the eggs are vis- 

 ible to the naked eye. They -reasure .116 of a ir.illiTetPT 

 in diameter. They are aiiong the smaller of the medusae eggs. 

 :.ietschrikoff gives the measurements of the ova of nineteen 



