52 
BRITISH ENTOMOSTRACA. 
that time, 6th February, five p. m., it resembled t. V, f. 4. 
The body was composed of two oval portions, of nearly 
equal size ; the upper having attached to it a pair of long 
antennae, and two large natatory feet ; the inferior having 
no appearance of legs or tail, but being merely notched 
at the extremity. 
On the 7th of February, at six p. m., or about twenty- 
four hours after birth, I found the abdomen had become 
more elongated, being then longer than the thorax, and 
had four slight protuberances, or knobs, on each side, at 
its upper part, the uppermost being the largest. The 
notched extremity had two short, sharp setae. The na- 
tatory feet were the same, but the whole animal had 
grown, and the eyes were visible, in shape of a black spot 
on each side of the head. 
On the ^8th, at six p. m., or forty-eight hours after 
birth, the thorax had become more square-shaped, and 
elongated, and the lateral eyes were larger. The knobs 
on each side of abdomen were six in number, the upper 
being the largest, and having a short seta making its ap- 
pearance at its extremity. The upper part of the abdomen 
was more bulging out at the sides, where the knobs ap- 
pear, and the whole animal was considerably elongated. 
On the 9th, at six p. m., or seventy-two hours after 
birth, I found the animal had grown in length. The 
knobs were increased to eight, the three uppermost with 
a seta each at its extremity. The alimentary canal was 
very large, extending from a short distance from under 
the central eye to the tail, taking up nearly half the 
breadth of the whole body as it passes down. At the 
upper part it forms a fork, with two short and blunt 
divisions. The antennae, and upper pair of natatory feet, 
continued much the same, but the lower pair had become 
smaller in proportion to the size of the animal, and dis- 
tinctly articulated ; the basal joint being large and fleshy. 
The caudal setae were considerably longer. The central 
eye was rather smaller, and the lateral eyes had become 
areolar. 
