599 REPORT OF THE COMMISSIONER OF FISHERIES. 
but were much freer from mature forms. Two contained a small 
number of Acanthocephala, 2 in one fish and 4 in another, and in 
8 of the 16 were found specimens of Distomum nodulosum. 
Nearly all of the perch taken in winter and early spring contained a 
number of 2. nodulosum, which were in every case filled with eggs. 
When the flukes were taken from the fish and placed in water, they 
would in a few hours invariably burst and a large mass of dark-shelled 
egos would drop to the bottom of the dish? The perch caught dur- 
ing August were not so likely to have this fluke in the ceca, but many 
of them contained the small, immature fluke in the gall bladder. 
13. Roccus chrysops, white bass. 
Four specimens were taken in July from Lake Mendota. Three of 
these were without food, the other contained insect larve. Parasites 
were not abundant. Nematodes were present in the stomach of 2 
and in the intestine of 1 bass, and Acanthocephala were taken from 
the stomach of a single specimen. Forbes (c, d) found these fish to 
have eaten may-fly and dipterous larve very abundantly, and in the 
stomach of one he found a sun-fish. Forbes (c, @) found insect larve 
to be the principal food of the white bass, and also found, in small 
quantities, fish and crustacea. 
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ZAcHARIAS, O. Die mikroskopische Organismenwelt des Siisswassers in ihrer 
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