WiLLiAUs. — Eye of Flounder. 



PLATE 3. 



Fig. 13. Botkus. Anterior face of a cross-section through the nasal pits of a fish 



in Stage IV. X 40. 

 Fig. 14. Bothus. Dorsal aspect of a frontal section through a fish of Stage II. 



X 100. 

 Fig. 15. Pseudoplcuronectcs. Supraorbital bar cut in frontal section showing signs 



of resorption. X 760. 

 Fig. 16. Bothus. Anterior face of a cross-section from the same individual as in 



Fig. 13. X 40. 

 Fig. 17. Pseudopleuronectes. Anterior face of a cross-section of the head of a fish 



in Stage I. X 200. 



