08C KEPORT OF COMMIS.SIOXKK OF FLSII AND FISHKRIES. [130] 



EXPLANATION OF PLATE V. 



Fig. 24. Tail of embryo cod on the tbirtceuth day, viewed from below, showing the 

 position of the 5 elk hlastopore hi. x G.""). 



Fig. 25. The same seen somewhat obliquely iiom the ^^ide, with the chordii dorsalis 

 shining through. 



Fig. 26. Embryo cod fourteen days old, seen from below, x 55. 



Fig. 27. Head of an embryo eleven days old, viewed from above, nearly as far ad%auced 

 as Fig. 2f), in optic section, showing the structure of the head, x 150. 



Fig. 28. Head of embryo seventeen days old, from the side, showing the lumen of the 

 heart h, the nasal and auditory vesicles, the vesicles of the primary di- 

 visions of the the brain, lateral longitudinal fold j7 of the right side, which 

 develops into the i)ectoral or breast tin. 



Fig. 28 a. Tail of an embryo cod, looking nearly at its end, showing the blastopore 

 hi and the lumen of Kupffcr's vesicle kv, s. .55. 



