8 



vipvfed frcni above, at first shows a nenrly circular de- 

 nression v/hich vpry soon sTDreads laterally and begins to 

 grow down. This first furrow is wide and leaves the blasto- 

 n^eres se^^arated s^-^e distance frcr each other as it rrc- 

 gresses downward, as is seen by loo'/ing at the egg frop 

 the side (Figs. 4 and 5). This furrov retrains oren u-^til 

 the egg^is alnost senara'feed into tv,-o narts: the blastoTeres 

 being connected sirrnly by a narro-^ orotoolas'nic fil- at 

 the lower "Dole. Prctonlas^iic currents can freauently be 

 seen in this connecting thread. Bu'^ting ('93) describes 

 and figures in Hydractinia a Drctoolas-ic thread in the two 

 cell stage in whi^h she also notes ^rctonlas'-i'^ roveTents. 

 The con-^ecting fil'^ in StOTOtpca anicata is not as clear 

 and definite in outline as she shows it in her figure of 

 Hyd ractinia. The two cells gradually -O'^e in close nrox- 

 i-ity and in a short time the con-ection of orotonlas'n at 

 the lower oole is broken and the ccrnlete two-celled stage 

 is forn-ed (Fig. 6). 



