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 setse. 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. in., 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 setse were considerably longer. The central 

 eye was rather smaller, and the lateral eyes had become 

 areolar. 



