152 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
on the appendages during the embryonic stages, and were 
hatched out as larve. 
These numbers of successfully hatched fish and lobsters 
compare favourably with the proportions given by other 
similar institutions abroad and in America; and with an 
adequate supply of spawn—which the absence of a spawn- 
ing pond has prevented us from having in the past—there 
could be no difficulty in rivalling the grand totals of Capt. 
Dannevig in Norway and of the United States Fish Com- 
mission. 
We have not, however, been content with merely 
hatching the ova, and setting free the larve, but have 
endeavoured to keep them for a time with the view of 
tiding over the younger and more defenceless stages. It 
is in this second attempt—the rearing, not the hatching— 
that we have had as yet poor success. The larval fish 
have lived with us for a short time, and have continued to 
grow and develop up to a certain stage. But there has 
been no evidence that they have fed systematically upon 
what we have supplied, and eventually all have died off 
before reaching the period of metamorphosis into small 
flat fish. 
In regard to the rearing of the young lobsters, although 
Mr. Scott took great pains to try to supply them with 
various kinds of food, and kept them under varied condi- 
tions in the hope of hitting upon the environment they 
required, the larvee seemed unable to get over the succes- 
sive periods of ecdysis, or casting of the shell—always a 
critical period in the hfe of a Crustacean. Some lived as 
long as three weeks after being hatched, but none survived 
the third moult. However, the matter will be tried 
again with further variations in the food and surrounding 
conditions. 
With a view of seeing what was done elsewhere with 
