Pl.ATK II. 



Fig. 17. Stone on whicli liavc been deposited eggs of a tisli (Species I.) 

 (Nat. size.) 



„ 18. Detached egg containing embryo, from photo by transmitted ni.'ht 

 (X 40). 



„ 19. Group of eggs containing embryos, from photo by reiiected ligl.t. 

 (The eggs are in situ on the stone.) 



„ 20. Xewly-liatclied htrva of Species I. 



„ 21. Two eggs of Species II. detaclied from sliell of barnacle and photo- 

 graplicd by reflected light (x 15). 



„ 22. Xewly-hatched larva of Species II. 



(Note. — The origin of the dorsal lin is not sufiiciently indicated in 

 drawing.) 



