of the Fishery Board for Scotland. 



235 



Fig. 6. Egg of long-rough dab on the third day (24th March), at 8 p.m. The embryo 



is now outlined, and traces of Kupffer's vesicle have appeared, though the 



blastopore has not yet closed, x 52. 

 Fig. 7. A portion of an egg of the same age (viz., at 8 p.m. on the 24th), showing an 



open blastopore, x 52. 

 Fig. 8. Blastopore now closed, and Kupffer's vesicle and muscle-plates distinct, 25th 



March, x 52. The zona is indicated at z, and the fine creases are still 



present. 



Fig. 9. Embryo now presents yellowish pigment, and the tail is free from the yolk, 

 30th March. x 52. 



Fig. 10. Embryo of the 1st April, with the pigment still unbranched, both yellow 



and black chromatophores being present, x 52. 

 Fig. 11. Larva removed from the egg on 4th April. The pigment has only branched 



on the head, and the esophagus and rectum are solid, x 33. 



PLATE VII. 



Fig. 1. Larval long-rough dab removed from the egg-capsule, 5th April, and showing 

 a more advanced condition of the pigment than in fig. 11 of the previous 

 plate, x about 33. 



Fig. 2. Larval specimen three days older, viz., on the 8th April, and in which the 

 pigment has now been grouped in bars, x about 33. 



Fig. 3. Older larval form in which most of the yolk has been absorbed, and the 

 pigment boldly arranged in bars. The pectorals are fan-shaped ; 10th 

 April, x about 23. 



Fig. 4. Dissection to show the caudal portions of the ovaries in Anguilla vulgaris. 



RO, right ovary ; LO, left ovary ; Rpr, Pars recurrens of right ovary ; 



Lpr, Pars recurrens of left ovary ; Rt, Rectum ; K, left kidney ; frv, 



fissura recto vesicalis ; Bl, urinary bladder; a, Anus; u, opening of 



urethra. (See p. 193.) 

 Fig. 5. Section of tumour from the stomach of saithe. Somewhat reduced. 



PLATE VIII. 



Fig. 1. Unfertilized egg of the turbot, immediately after extrusion, July 2nd, 1895. 



x 33. 



Fig. 2. Egg of turbot, June 22nd, 1895, 6 p.m., in the multicelled condition, 



x33. 



Fig. 3. Egg of turbot, June 22nd, 1895. Nuclei seen in the blastodisc, which in this 

 instance is peculiar, the egg having been subjected to a long journey on a 

 hot day. x 33. 



Fig. 4. Egg of turbot, 27th July, 1895, 8 p.m. (fertilized at 1.30 p.m. same day) ; 



blastodisc shown, x 40. 

 Fig. 5. Egg of turbot, 22nd June, 1895, 5 p.m. Fertilized June 21st, 5 p.m. The 



germinal cavity and margin of the shield are seen. x 33. 

 Fig. 6. Egg of turbot, 24th June, 1895, fertilized 5 p.m. June 21st. Peculiar vesicles 



are present in the caudal region of embryo. x 33. 

 Fig. 7. Egg of turbot, 23rd June, 1895, 4 p.m. Numerous vesicles are shown in the 



caudal region. x 52. 

 Fig. 8. Egg of turbot, 25th June, 1895. Red pigment-spots have appeared on the 



body of the embryo. x 52. 

 Fig. 9. Egg of turbot, ventral surface, 25th June, 1895. The red pigment-spots 



are larger. A few black pigment-corpuscles are seen in the yolk and in 



the caudal region of embryo. x 52. 

 Fig. 10. Egg of turbot, from ventral surface, 27th June, 1895. The red and black 



pigment corpuscles are now stellate. The tail overlaps the eye on the 



right, and is bent up. x 52. 

 Fig. 11. Embryo of turbot, 28th June, 1895, 8 p.m. The quantity of red pigment 



has increased very much. x 33. 

 Fig. 12. Head-region of embryo of turbot, about two days after the foregoing. The 



mouth is open. The yolk has decreased in amount. x 52. 

 Fig. 13. Embryo of turbot, 1st July, 1895. Later stage of the above ; oil globule 



indistinct. Pigment above the head. Eye greenish, x abt. 33. 

 Fig. 14. Larval turbot, hatched on 26th June, with yolk now absorbed and viewed by 



reflected light, on the 8th day, viz., 4th July, 1895. x 21. 

 Fig. 15. Pleuronectid larva (Dab ?), with deep body and pale pigment, June 29th 



1895. x abt. 50. 



Fig. 16. Same larva, June 30th, 1895, 4 p.m. The whitish pigment still occurs 

 along the dorsal and the ventral edges of muscle-plates, x 52. 



