Plate II. 



Fig. 17. Stone on which have been deposited eggs of a fish (Species I.) 

 (Nat. size.) 



„ 18. Detached egg containing embryo, from photo by transmitted light 

 (X 40). 



„ 19. Group of eggs containing embryos, from photo by reflected ligh-t. 

 (The eggs are in situ on tlie stone.) 



„ 20. Xewly-hatched larva of Species I. 



„ 21. Two eggs of Species II. detached from shell of barnacle and photo- 

 graphed by reflected light (X 15). 



„ 22. Newly-hatched larva of Species II. 



(Note. — The origin of the dorsal fin is not sufficiently indicated in 

 drawing.) 



