1900-1901.) Report of the Microscopical Section. 229 
antenne are of considerable size, comprised of numerous 
articulations, and are covered with sete. The inferior 
antenne are much smaller. 
_ There are five pairs of feet, which spring from the thorax 
—a pair from each of the segments; the fifth pair is small, 
and almost rudimentary. The first four thoracic pairs are 
bi alike. Each foot consists of two branches, springing from 
ra common base: each branch has three articulations, and 
is provided with numerous plumose sete. Arising from 
the root of the base of each foot is a long, finely plumose 
seta. These two sete incline inwards towards each other, 
and nearly, if not altogether, meet. The tail consists of two 
‘pieces, each terminated by four finely plumose sete. The 
_plumose setz of the tail and thoracic feet are extremely 
pretty objects when seen under the microscope. 
The shell of the thorax is so transparent that with a good 
light the eggs may be seen in the ovaries: these ovaries 
are situated in the middle line, and give off an oviduct on 
each side of the thorax. There are two ovisacs, one on 
each side of the first segment of the abdomen, and attached 
to it by a slender tube. These ovisacs may frequently be 
‘seen. They are of various colours, and seem each to contain 
about thirty eggs. 
Canthocamptus.—The Canthocamptus is a genus belonging 
to the same order as the Cyclops. The generic name is 
_ derived from the long flexible spines of the tail. The species 
_ studied was the Canthocamptus minutus of Baird, an inhabitant 
of fresh-water ponds and ditches. 
_ The shell consists of ten segments, gradually decreasing in 
size towards the tail, but the thorax and abdomen are not 
distinctly separated as in the Cyclops. The body between 
the fourth and fifth articulations is very flexible, so that 
the hinder part can be turned up at right angles to the 
anterior part. 
_ The antennz, compared with those of the Cyclops, are com- 
_ paratively short, and are furnished with sete; but, on the 
_ other hand, the feet are much longer than those of the 
Cyclops, and are beautifully plumose. In those which were 
iy. 
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