70 



St . 



' this la; 

 j ies of stru een noted in the ;ions 



Lates. It is not my intention 

 extended discussion of its for i . rer it 



will he well to describe briefly the various modes of its 

 for ation in other Teleosts anc to . of these 



classes the Piperh; s, and fi 



this ertabj 

 jieosts, 

 three ty . : 



I , ] Ln whi it: 'ough 



to the yolk, periblast is forme y a in smic 



sheet exten' i i l om the " Ran ', mneguy ( '£ . 



63) shows this ver; for the Trout. 



II. In eggs in which there is no lay 



under the germ-disc, or those in which the protoplasmic i 



: . from the yolk, th - .ast is for 



when the inner ends of the cells in trie four and eight-celled 



i 

 .. is the mode of ; 

 "err anus (" r ilson *3i), Ctenolabru s ■ ■' '85), 



