578 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [122] 



X. 



EXPLANATION OF PLATE I. 



FIG. I. Unimpregnated mature egg of the cod, shovnng the outer vesiculated proto- 

 plasmic germinal layer i^r, covering the yelk, x 55. 



FiG. 2. A smaU portion of the protoplasmic germinal layer, more magnified, showing 

 numerous minute included vesicles, x 225. 



Fig :{ A similar portion of the protoplasm layer of an impregnated egg. The v«8.- 

 ' ■ cles have united or become contiuent, larger, and lees numerous, x 225. 



Fig. 4. A stage between 2 and 3, showing the protoplasmic layer in section, with the 

 vesicles lying next the outer surface, x 225. , . ^ . 



Fig. 5. A portion of the vitelUne membrane in optic section, showing the structure of 

 the micropyle. x 1200. . 



FIG 6 Cod's e-g one and a half hours after impregnation, the protoplasmic layer 

 * ' traveUng in beaded streams towards the lower pole in an amCEboid man- 



ner. x 55. . ■j.i. ^.-u 



Via 7 Cod's egg three hours and forty minutes after impregnation, with the germi- 

 nal disk defined, and the beaded protoplasmic processes extending out- 

 wards and upwards from it. clasping the yelk, x 55. 

 Fio. 8. Algous growth, containing brown chlorophyll bodies, found attached m great 

 numbers to the viteUme membranes of developing eggs of the cod. x 500. 



