EMBRYOLOGY AND LARVAL DEVELOPMENT OF TELEOSTEAN FISHES. 131 



Fig. iij. — Mature unfertilized egg. 



Fig. 114. — Egg with fully difierentiatcd blastodisc (I*D). 



Fig. 115. — Egg with blastoderm of 4 cells. 



Fio. 116. — Egg 24 hours after fertilization. 



Fio. II7-— Eggs 68 hours after fertilization. Fig. iiS.— Egg 4 days after fertilization. 



GASTEROSTEUS ACULEATUS. 



