464 
,T. GIJAY. 
1 
eggs according to the strength of hypertonic solution with 
which they have been treated. The blastnlse derived from 
these irregular eggs are all abnormal (Text-fig. 4). Probably 
none of them develop further. Some, however, appear to be 
Text-fig. 2. 
Eggs of E. esculentus which had been treated with hjiiertonic sea- 
water for half-an-hour. Four hours after fertilisation. 
“ half blastulee,'’ i. e. only one side of them is iiwegular. At 
a later stage only healthy plutei are found, and these have 
developed from eggs whose segmentation was normal. 
'J’here are also, however, a few plutei half the normal 
size — apparently these have developed from the stereo- 
blastulm. 
