252 
and larva from material treated at the Piel 
Hatchery. The average temperature of the 
water in the hatching boxes during the 
developmental period was 7° C. 
Fig. 36. Larval Plaice at the beginning of the metamor- 
phosis. The yolk-sac has been absorbed, and 
the larva is beginning to feed. Note the 
beginning of the asymmetry—the left eye is 
more dorsal than the right. Note also the 
upturned end of the notochord. Nat. size 
= 1dmm. x6. (After Ehrenbaum, Kier 
und Larven von Fischen der Deutschen 
Bucht. Wiss. Meeresuntersuch. Kiel. Komm. 
Bd. 2, Heft I., Abth. .I., Plate 4, ag >oia 
1896.) 
Fig. 37. First bottom stage of the Plaice. The 
metamorphosis is completed. Note the 
relatively large size of the eyes and the small 
paired fins. x4}. Nat. length = 13 mm. 
(After Petersen, 4th Rep. Danish Biological 
Station. Pl. I., fig. 10. 18938.) 
ae 
