BAIRDIELLA CHRYSURA AND ANCHOVIA MITCHILLI. 



13 



appearance of adult individuals. However, the depth of the body in the thoraxic 

 region is relatively great and the head is relatively large and blunt. They are also 

 somewhat lighter in color. 



Figure 24 illustrates a young fish 30 mm. in length. The fins are now fully 

 differentiated and the entire surface of the body is covered with scales. However, 

 the scales are still small and deeply embedded in the skin. They are, therefore, not 



rf<^fe 



Fig. 23. — Bairdiella chrysura. Larval fish ii mm. in length. 



Fig. 24. — Bairdiella chrysura. Fish 30 mm. in length. 



shown in the drawing, 

 with adult individuals. 



In form and color fishes of this size are practically identical 

 In short, they show all the diagnostic characters of the species. 



ANCHOVIA MITCHILLI. 



Spawning. — The eggs of Anchovia mitchilli were present in the plankton when work 

 was begun on June 9, and were collected in the tow net nearly every day after that date 

 until August 23, when the work was discontinued. During the second and third weeks 

 in June the eggs of this species were not abundant, though they were sufficiently numer- 

 ous to be readily obtained for study. Toward the close of June they became numerous, 

 and they were much more abundant in the plankton during July and August than the 

 eggs of any other fishes spawning during these months. The height of the spawning 

 season is probably reached during July. 



As already indicated, this species, like Bairdiella chrysura, spawns regularly in the 

 early evening, probably before 8 o'clock p. m. On a few occasions newly spawned eggs 

 were collected before 6 o'clock p. m. Usually, however, no newly spawned eggs were 

 19371°— vol 33—15 2 



