3 

 this case cells of Fig. 7, Pi, 



, II ., is a section at - gles to 



long axis of a blastoderm similar to Fig. 7 , PI, I. TJ ere 

 the two cel^s are sej - 



mentation cavity ( s.c . ) roofed over* by a proto 



' ., . . connecting the two blastomeres, A thin split 

 extends for some distance under eac 



arates it from the central periblast f c.p . ) which is heavily 

 laden with yolk in its rts. Such proto >ridg- 



es as the one si t 3 are not uncommon in this and the 



next st l . All that can be said of their origin is that 



cells were cut out of the A 

 Structure. to this would be found bj sections 



at right angles to Pigs, 3 and ■ , L,I, So far as I know, 

 these protopl not bee. 



ed before , 



- last never co the yolk, 



but is so obscu of this latter, that it 



has in -ill cases been drawn se - Lcelly, the gener- 



al course of the break only being folio. 



. PI. I. shows a type oi 

 far more common in the Pipefish than i . In this 



the plane of the third furrow shifts until it becomes e. 



