942 PROFESSOR W. C. M'INTOSH AND MR E. E. PRINCE ON 



Fig. 9. Larval ling (Molva vulgaris), 5th day, May 2, 1886, . . . . x 90 



Fig. 10. Larval example of undetermined Pleuronectid, obtained in St Andrews Bay 1887, . x 90 



Fig. 11. A young example of Callionymus lyra, 10 mm. in length, . . . . x 5 



Fig. 12. Ovum of Gadus morrhua in the morula condition; blastomeres somewhat rounded, . x 60 



Plate XX. 



Fig. 1. Anarrhichas lupus, larval tail showing radial striations, . . . . x 40 



Fig. 2. ,, ,, larva just emerged, and viewed from the left side, January 28, 1886; the 



great vitelline vein is indicated through the semi transparent yolk, . x about 12 

 Fig. 3. Tail of the same at a more advanced stage, and when the blood-vessels form a fan, March 2, 



1886, ........... x 40 



Fig. 4. Larva of Anarrhichas lupus, just emerged, viewed from the right side, January 28, 1886, . x about 12 

 Fig. 5. Dorsal view of a newly -hatched larva of the same species, January 1886, . . . x about 12 



Fig. 6. Group of firmly adherent ova of the wolf-fish {Anarrliichas lupus), with embryos far 



advanced, ........ Somewhat enlarged 



Fig. 7. Fresh ovum (unimpregnated) of the same species, .... Somewhat enlarged 



Fig. 8. Surface of lamina of the zona radiata in AnarrMchas, ..... x 500 



Fig. 9. Egg of salmon (Sahno salar) : a, seen from above ; b, viewed laterally, February 2, 



1862, ......... Somewhat enlarged 



Fig. 10. Egg of the same species, similarly viewed and magnified. 



Fig. 11. Portion of the zona radiata of the egg of the salmon, viewed as a transparent object, . x 300 



Fig. 12. Caudal region of the embryo of Gadus ceglefinus, 9th day after fertilisation, showing the 



neurenteric canal (?), . . . . . . . . x 70 



Fig. 13. Rectal region in the larva of Molva vulgaris, showing the communication of the urinary 



vesicle with the early rectal lumen, . . . . . . . x 70 



Plate XXI. 



Fig. 1. Anterior end of larval Anarrhichas lupus seen from the right side, February 16, 1886, . x 24 

 Fig. 2. View of the circulation in the yolk-sac of the same species from the left side, February 23, 



1886, ........... x 44 



Fig. 3. Yolk-sac of more advanced larva of Anarrhichas, with oil-globule on the right side, May 1, 



1886, ........... x 18 



Fig. 3a. Yolk-sac of the same larva viewed from the left side, May 1, 1886, . . . x 18 



Fig. 4. Oblique view of the head of the larval Anarrhichas, January 1886, . . . x 24 

 Fig. 5. Group of cells from the yolk-sac of the same form, ..... x about 650 



Fig. 5a.Altered blood-discs from larval Anarrhichas, ..... x about 650 



Fig. 6. Anterior end of segmental duct in the larval cod, May 10, 1886 ; reduced from a drawing x 200 

 Fig. 7. Sensory bodies beneath the epiblast on the under surface of the snout of embryo of haddock, 



13th day after impregnation, ........ x 435 



Fig. 8. Horizontal section through the myotomes of the embryonic haddock on the 4th day after 



impregnation, .......... x 435- 



Plate XXII. 



Fig. 1. Solea vulgaris, ovum in the lenticular stage, and showing a few of the vesicles of the yolk 



under the periblast. The cells of the blastoderm for simplicity have been omitted, . x 50' 



Fig. 2. Tail of late larval Anarrhichas in April, the margin being now crenate, and the vessels well 



developed, . . . . . . . . . . x about 60 



Fig. 3. Vitelline circulation in the larval Anarrhichas on February 22, 1886, as seen from the right 



side, . . . • • . . . . . x 44 



Fig. 4. Salmon, 1 day old, ........ Slightly enlarged 



Fig. 5. Abnormal yolk-sac of salmon, ....... Slightly enlarged 



Fig. 6. Salmon, 1 week old, ....... Very slightly enlarged 



Fig. 7. Yolk-sac of the salmon with the oleaginous sphere at the tip ; an unusual position. 



