100 



MARKETABLE BRITISH MARINE FISHES chap, 



Fig 51. 



G.S. 



Fig. 54, 



Figs. 50-54. — The development of a l^uoyant marine fish-egg. 50. The fertilised 

 ^gS- 5'- T^^'i same when the germ-skin has spread over half the yolk. 52. 

 The same when the germ-skin has nearly enveloped the yolk. 53. The same 

 when the embryo is advanced in development, and the tail has begun to grow 

 out. 54. The newly hatched larva. Yk, yolk; Ge, germ; G.S, germ-skin; 

 N, nostril; Hd, head; Ht, heart; A, organ of hearing; E, eye; I, end 

 of intestine ; F M, fin-membrane. 



