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TELEOSTEAN EGG.— Eig. 5. 

 Plate Y. 



Fig. a X 135; b, c, d X 450. 

 COD~fr/) obliquely transverse section near the posterior end of a 4tli day embryo ; 

 (6/c/fZ) the ventral lip of the blastopore of embryos of 3rd, 4th and 5th days respectively. 



