of the Fishery Board for Scotland. 



249 



Plate ix. 



Fig. 1. Egg of the coal- fish or green cod (Gadus virens) fertilised on 31st 

 March at 4 p.m. in Shetland, and figured at 9 p.m. on April 

 3rd, 1893. The blastopore is closing. x 33. 



Fig. 2. Egg of the same species next day. The blastopore has closed, and 

 Kiipffer's vesicle is present. The muscle-plates are also forming, 

 x 33. 



Fig. 3. Egg of the green cod on the 6th April, showing radiate fibres from 

 the pectoral region, and the presence of black pigment over the 

 yolk, and also indications of similar chromatophores along the 

 body. Similarly magnified. 



Fig. 4. Egg of the same species, of date 7th April, with a general distribu- 

 tion of pigment, and indications of chromatophores along the 

 body. Similarly magnified. 



Fig. 5. Another specimen, of date 7th April, in which the pigment over 

 the yolk is somewhat less marked, but the black chromatophores 

 along the body and tail are distinct. Similarly magnified. 



Fig. 6. Egg of date 8th April, with advanced embryo, which has a series 

 of conspicuous black chromatophores along the sides. The tip 

 of the tail now reaches the head. Similarly magnified. 



Fig. 7. Embryo of the green cod, partially hatched, and with the pigment 

 over the body and yolk-sac largely developed. x about 33. 



Fig. 8. Unknown egg, resembling that of the mackerel, from Aberdeen, 

 11th June 1892. x 44. 



Plate x. 



Fig. 1. Early condition of the small egg resembling that of the dab, and 

 measuring -6858 to '7620 mm., 10th June 1892. x about 57. 



Fig. 2. The same egg on the 11th June, with the pigment developed. 

 Similarly magnified. 



Fig. 3. Free larva of the first day — from the foregoing. x 44. 



Fig. 4. A larva of the same age (12th June), showing a peculiar movable 

 oleaginous area in the yolk. x 44. 



Fig. 5. Early post-larval fish (hatched on the 13th June) from the same 

 kind of egg, 21st June 1892. x 21. 



Fig. 6. Unknown egg measuring 1*3335 mm., with advanced embryo, 

 11th June 1892. x ^44. 



Fig. 7. Larval fish from the foregoing, in a somewhat unhealthy condi- 

 tion, 16th June 1892. x 44. 



Fig. 8. Unknown egg, measuring 1*2192 mm., with a considerable peri- 

 vitelline space, 12th June 1892. x 44. 



Fig. 9. The same egg, with the large embryo in a lateral position, 13th 

 June 1892. x 44. 



Plate xi. 



Fig. 1. Sketch of the peculiar example (hybrid?) of the poor cod, by Mr 

 Masterman. Life size. 



Plate xii. 



Fig. 1. Tumour from the dorsal muscles of the tunny. 

 Fig. 2. Section of the foregoing. Zeiss, oc. 3, obj. D. 

 Fig. 3. Larval fish, of 16th June 1892, from the unknown egg with a 



considerable Perivitelline space. 

 Fig. 4. An older example of the same species viewed from the dorsal aspect, 

 x 44. 



Fig. 5. Unknown larva having only black pigment, 17th June 1892. x 

 about 21. 



Fig. 6. Turbot-like form enlarged under a lens. 



Fig. 7. Young turbot of about 14 mm. enlarged about six times. 



