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Bulletin Wisconsin Natural History Society. [Vol. 10, Nos. 3-4. 
or wandered boldly about “poking” between the dead leaves. Their 
transparency made them difficult to see, even when their location 
was approximately known. The most conspicuous parts of a male 
were the two white testes which could often be seen when the rest 
of the body was indistinguishable. The females were even more 
difficult to discover than the males, for they lurked on the bottom 
in spaces between the debris or lay on their backs “fanning” with 
their appendages. They were never seen to swim about in leisurely 
fashion like the males, and in moving from place to place they 
usually made quick darts from one shadowy hole to another. 
Occasionally a female was seen at the surface in the shadow of 
a iloating stick, usually with the body at an angle of about 55 0 
with the surface of the water and with the ventral side toward 
the bottom—a peculiar position. The coloration of the males is 
apparently adapted to their needs for they must wander about in 
order to find mates. That of the females also makes them incon¬ 
spicuous, as they rest quietly in holes at the bottom, keeping their 
eggs from harm, or await a mate at the surface in the shadow of 
some shelter. The coloration of each sex is apparently adjusted 
to its behavior in such a way that it is well protected. 
More males were observed and collected than females, but this 
may have been on account of the secretive habits of the latter. 
A number of animals were seen in the pond where the fairy- 
shrimps occurred which might have fed upon them. Among these 
may be mentioned:—Tadpoles, Dytiscus, Hydrophilus, and wood 
frogs. On two occasions dytiscid larvae were seen swimming with 
dead male Eubranchipi in their mandibles. Little was learned 
concerning the food habits of the fairy-shrimps. The contents of 
the stomachs of several males were examined with a compound 
microscope and found to consist of fine silt, minute organic par¬ 
ticles, oil droplets, etc.; but there was nothing that could be surely 
identified. 
Many individuals were brought into the laboratory and put in 
large glass dishes where they were observed from time to time, 
the sexes being kept separate. The males lay quietly at the bottom 
on their backs or swam about belly up; the females behaved in a 
similar manner, but spent more time at the bottom, and also some¬ 
times swam about at the top of the water with the ventral surface 
down and the bodv inclined somewhat. 
