NORTH SEA INVESTIGATIONS. 193 
underlying the blastoderm (Fig. 8). None were visible in the vege- 
tative third of the yolk mass, nor did they extend, as a rule, to the 
periphery in any region, ‘The blastoderm was opaque and granular. 
as was also, but to a less degree, the unsegmented part of the yolk, 
Fig. 2.—Living unfertilized egg forty-eight hours after extrusion. 
Fria. 3.—Dead unfertilized egg forty-eight hours after extrusion. 
The segmented part, however, retained in great measure its former 
translucency, but the segments, especially those near the surface, 
were very irregular. I consider that this condition was arrived at 
by decomposition setting in from the periphery, involving the break- 
ing down of the peripheral segments, and not by a shrinkage of the 
segments towards the central area. 
To recapitulate: the egg of the scad is pelagic, and measures 
