44 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
collected, and of larval fish set free on the various days, is as 
follows :— 
Eggs collected. Date. Larvae set free. Date. 
37,800 ... Feb. 24 to March 2 24,150 ... March 22 
719.800 ... March 5 65,100 «2 Sees 
PR OSOO i kay om 8 to 10 249,480. 2 ees 
SHO MOO 225 gs > bo 298,200 ... April 1 
S542600 2 Wee oto. 20 672,000, "aaa 9 
870,450 -... ° 4,0 “22 te 24 647,850 "2.7 eae 
9A 100. 5. = osama 354,900 _.. 0) eee 
HTT DOO... Ss, S29ands0 381,100 eee 
980,700 ... 4, sistetApnalis 832,650 2. ee 
2000) .. April xpsand 7 359,950. - 2.25 eee 
AT 20 ce. fae 311,650> See 
530,000 2. = e2rand to 286,650 > See 
ZISO007F oe 25, 211,050 - eee 
ANT.900. “xe IN and 19 362,250 <2. Maye 
514.500) Si” oe 4 2ieandt2s 221,300" Saar 6 
142,800 ...-_,, , 26 and 30 280,350 22:3 
6,664,250 Total eggs. 5,625,180 Total larvae. 
“Tn one of the Aquarium tanks we now have on view 
about a score of plaice hatched during the season of 1913 
and since reared in one of the spawning ponds. The largest 
are 8 inches long. Probably half the number have more 
or less pigmentation on the normally unpigmented or “ eyeless ’ 
side. In one case the pigmentation covers the whole of the 
“eyeless ’ side except the head. In several others rather more 
than the posterior half of the ‘ eyeless’ side is uniformly 
pigmented, and in others the pigmentation occurs in groups 
of spots. In most cases the pigmentation is of exactly the 
same depth as that of the ‘ocular’ side, but in one of the 
largest fish it is distinctly paler. We have always noticed 
the prevalence of pigment on the ‘eyeless’ side of young 
plaice reared in our ponds, and it is evident that factors other 
than light contribute to its formation. 
