EMBRYOI.OGY AND I^ARVAl^ DEVEI.OPMENT OF TELEOSTEAN FISHES. II3 



Fio. 58. — Egg with blastodenn in advanced stage of cleavage. Fig. 59. — Egg showing advanced stage in differentiatian <tf 



embryonic axis. 



Fig. 60.— Egg with embryo showing 12 to 14 somites, blastopore 

 closed. 



Fig. 61.— Egg with advanced embryo. 



Fig. 62.— Newly hatched fish, acttial length a mm. 

 PORONOTUS TRIACANTHUS. 



