EXPLANATION OF PLATE XVIII. 



Hemiramphus limbatus, Cuv. and Val. 



Fig. i. — An outline of the larva at stage III, x 40. 



,, 2. — The head region of the larva showing the development of the visceral 



arches, x 80. 



,, 3. — The larva at stage IV, x 40. 



,, 4. — The larva at stage V, x 30. 



,, 5. — The larva at stage VI, x 30. 



,, 6. — A young fish at stage XIII, x 20. 







Explanation of Lettering. 



a = eye; a' = beak; b = visceral arch; V = heart; c = gas-bladder ; c' = stomach; d = oesophagus; 

 6 = anus; e' = notochord ; / = chromatophore (big); g = caudal fin; g' = dorsal fin-fold; h = ventral fin- 

 fold; i = rudiments of branchiae: / = liver; k = chromatophores in gas-bladder; k' = chromatophores 

 (small); 1 = upper jaw; m = parallel rows of cartilage cells; m' — operculum ; n = dorsal row of chro- 

 matophores; n' = middle row of chromatophores; — ventral row of chromatophores; p = dorsal fin; 

 p' = anal fin ; q = retia mirabiha ; r - pectoral fin ; s = caudal fin : t = fin-ray ; u — baseost ; v = myotomes ; 

 w = pelvic or ventral fin ; x — axonost ; y = brain and spinal cord. 





