742 DEPTHS OF THE OCEAN 



300 metres, mainly those of the genus ArgyropekciLs, the adults 



Fig. 531. 

 Egg of Sconibresocid. Diameter, 2. 2 mm. Station 64. 



of which live at these depths. A third group containing larvae 

 and young of Alepocephalidse has only 

 been taken below 500 metres. We 

 see from Fig, 474, p. 621, that even the 

 small stages of Cyclothone are found 

 at 300 and 500 metres. 



It is interesting to note that the 

 young stages of pelagic fishes are sub- 

 ject to the same laws regarding the 

 development of colouring and light- 

 organs as the adults. In the upper- 

 most 150 metres the young are quite 

 transparent, and many of them pos- 

 sess light-organs in very early stages. 



Early stages of Argyropelecus (see Fig. 534) develop the silvery 



Fig. 532. 



Egg of Trachypterus. 



Diameter, 2.8 mm. Station 55 



