of the Fishery Hoard for Scotland. 
321 
Fig. 5. Portion of the capsule (zona radiafa) of the egg of the torsk, from 
the living species. x about 50. 
Fig. C. Portion of the same egg. x 500. 
Fig. 7. Portion of the same capsule after desiccation in the open air. 
x 500. 
Fig. 8. Egg of torsk, fertilised 21st May 1892. 25th May. x 57. 
Fig. 9. Egg of the same species, 27th May 1892. Only a few pigment 
specks occur in tail. x about 50. 
Fig. 10. Egg of the same, 28th May 1892. Black pigment is more abun- 
dant, x 57. 
Fig. 11. Egg of torsk shortly before hatching. The greenish-yellow pig- 
ment is present on head and tail. x 57. 
Fig. 12. Larval torsk of the first day (1st June 1892). x about 33. 
Fig. 13. The same two days after (3rd June 1892). x about 44. 
Fig. 14. Young torsk nearly a week old, 6th June 1892. x 26. 
Plate XVI. 
Fig. 1. Egg of the sail-fluke (Arnoglossus megastoma), 28th May 1892. 
x 57. 
Fig. 2. Egg of the same, with the rim beyond the equator, 29th May 
'1892. x 50. 
Fig. 3. Egg of the foregoing after the formation of the lenses and the 
appearance of pigment in the embryo, 30th May 1892. x 57. 
Fig. 4. Egg in which the tail of the embryo is free from the yolk, and 
the chromatophores are stellate, 30th May 1892. 
Fig. 5. Newly hatched (and it is possible premature) larva of the fore- 
going, in which only black pigment is present. The peculiar 
character of the chromatophores of the marginal fin posteriorly 
is noteworthy. 1st June 1892. x about 26. 
Fig, 6. A larva of the same species in more vigorous condition and some- 
what older. The shape of the oil-globule, in lateral view, is 
interesting. 3rd June 1892. x 26. 
Fig. 7. Larva of the sail-fluke on the 2nd June, viewed from the ventral 
aspect as it floated. 
Fig. 8. Advanced larva of the same species, in which the canary-yellow 
pigment has appeared — with other structural changes. 7th June 
1892. x 21. 
Fig. 9. Ventral view of a dead larva to show the opening of the mouth 
and the opercular folds. 6th June 1892. x 85. 
Fig. 10. Micropyle of the egg of the sail-fluke, with a radiate arrange 
ment of ridges. x about 100. 
Fig. 11. Micropyle (?) of the egg of the halibut. x 185. 
Fig. 12. The same structure in another example of the egg of the halibut, 
x 185. 
Fig. 13. Dead (but fresh) ova of the halibut about natural size. The 
opacity is caused by the collapse of the protoplasm. 
Fig. 14. Egg of the brill undergoing segmentation. 24th May 1892. x 
about 57. 
Fig. 1 5. Egg of the same at a more advanced stage. 25th May 1892. x 
about 57. 
Fig. 16. Egg of the brill, in which lenses and pigment have appeared in 
the embryo. 27th May 1892. Similarly magnified. 
Fig. 17. Portion of egg of the same at 4 p.m. on the 27th May showing 
Kupffer's vesicle. x about 57. 
X 
