28 
BRITISH ENTOMOSTRACA. 
figure (t. I, f. 2). On the upper part a small black 
point represents the eyes ; and the first pair of feet, or 
rami, are very large, nearly as long as the animal itself, 
without articulations, and with only a few hairs at their 
extremity. The antennae are large, and project beyond 
the edge of the shell, having three rather long setae at 
their extremity, but the tail is not yet apparent. In fact 
at this period of their life, those portions of the body 
which in the adult are the largest, are scarcely visible, 
whilst those which are then small are now largely deve- 
loped. The motion of the little creature in the water is 
more that of leaping than swimming. At the end of 
twenty-four hours they have become of a white colour, 
and about this time they undergo the first change of skin. 
The body then is sharper interiorly, and there is the 
appearance of a tail terminating in two points. The rami 
are divided into three parts, each furnished with several 
hairs. The branchial feet are also more visible, though 
still incomplete, and the antennse, with the three setae, 
are even more largely developed still ; the eye, too, has 
become larger. After one or two days more the animal 
assumes a yellowish colour, and the body is larger and more 
pointed, while the rami and antennae have become smaller. 
The eyes and the branchial feet, on the other hand, have 
become more remarkable, and the tail begins to show 
its terminating appendages (t. I, f. 3). They grow gra- 
dually larger till about the fourth or fifth day, when they 
have assumed their proper form, but not their full size. 
The carapace has now its perfect shape, and upon its head 
is seen a large green patch, in which may be observed the 
eyes, of a black colour. The antennae are still large 
enough to pass beyond the edge of the buckler, while the 
rami, though not quite perfect, are now furnished with 
their ordinary long appendages, but not articulated. The 
mandibles are visible, of a yellowish colour ; the tail and 
its long appendages are tolerably perfectly formed, and 
the branchial feet nearly fully developed. At the end of 
eight or ten days they have acquired considerable size, 
