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Part IIL — Tenth Annual Report 
Fig. 18. Egg of the foregoing two days later, and with a great increase in 
both black and ochreous pigments. x about 57. 
Fig. 19. Larval torsk of the second day, in which a diverticulum (a) 
was attached to the rectum. x about 33. 
Fig. 20. Larval torsk with the mandible slightly projecting (though the 
mouth is not yet open). 1st June 1892. x 52. 
Fig. 21. Tail of larval torsk to show the fan-like arrangement of pigment 
at the tip of the tail. 6th June 1892. x 85. 
Fig. 22. Fine creases of the capsule (zona radiata) of the egg of the hali- 
but. The densely arranged pores cover the general surface, 
x 185. 
Plate XVII. 
Fig. 1. Melanotic tumour on tail of haddock, § natural size. 
Fig. 2. Section of the tumour showing pigment-corpuscles x about 400. 
Fig. 3. Section of the same showing spindle-cells and blood-vessels x Zeiss 
Oc. 2, Obj. D. 
Fig. 4. Section of -wall of abdominal tumour of cod x 250. 
Fig. 5. Left surface of abnormal plaice about natural size. The spots 
of black pigment have been omitted from the region of the 
abnormal fin. 
