Fig. 30. 
Fig. 31. 
Fig. 34. 
Fig. 35. 
251 
cross striated (R. lateralis, x.). The line of 
dashes represents the suppressed portion of 
the left supraorbital canal. 
Dorsal view of the brain of a Plaice having an 
extreme length of 58cm. x 3. ‘The pallium 
and the choroid roof of the fourth ventricle 
have been removed, but the asymmetrical 
position of the pineal tube and body is indi- 
cated. The dotted line shows the departure 
from the symmetry. The numbers are those 
of the cranial nerves. 
Lateral view of the same brain with the pallium 
in situ. x3. Numbers as in preceding figure. 
Prate XI. 
Embryo Plaice on the 5th day after fertilization 
and before invagination of the optic vesicles. 
x 29. 
Embryo Plaice on the 9th day after fertiliza- 
tion. The black spots on the body and tail 
represent the yellow branching chromato- 
phores which appear about this time. x 29. 
Embryo Plaice on the 17th day after fertiliza- 
tion. The embryo is ready to hatch. The 
branching black markings on the body and 
tail are the black chromatophores. The 
yellow pigment is represented by the grey 
spots. x29. Nat. size of this and the 
preceding eggs = 1°88 mm. 
Newly hatched Plaice, 17 days after fertiliza- 
tion. The black pigment is represented by 
the stellar markings, the yellow by the grey 
spots. x17. Nat. length = 63 mm. 
Figs, 32—35 are drawn from the living eggs 
