DAPHNIA. 
93 
very readily. I procured a few specimens in the begin- 
ning of April, along with the pulex. All those I detected 
had the ephippium upon them, and, two or three which 
I isolated, died very soon after throwing it off. I re- 
moved, however, these ephippial ova, placing them in a 
glass of water by themselves. In about twelve or fourteen 
days, I had the satisfaction to find the young born from 
one of these exuviae ; and upon careful examination, I 
was perfectly satisfied of this being a distinct species, as 
these young animals resembled, in every respect, their 
parent. Later in the season, I had opportunities of ob- 
taining adult females with ova, and witnessed the young 
hatched. These perfectly resembled the adults, in the 
shape of the head, &c. 
Hab . — Pond on Blackheath ; April, June, Sept. 1848. 
3. Daphnia Schcefperi. Tab. VII, figs. 1, 2 ; Tab. VIII, 
figs, a — i. 
Gescjtwanzten zackiger Wasserfloh, Schceffer, Die griinen Arm- 
Polyp., t. 1, f. 8, 1755. 
Branchipus con chiformis primus, Schaffer , Element. Entomol., 
t. 29, f. 3-4. 
Daphnia pulex, Koch , Deutsch. Crust., h. xxxv, t. 15. 
Daphnia, Eymer Jones, Outlines of Animal Kingdom, 330, f. 155. 
— Eichhorn, Beytrage zur Naturg., t. 5, f. H (after Sehoeffer). 
Carapace nearly circular, prominently convex in the 
centre, and sharply keeled round the circumference pos- 
teriorly. Inferior extremity terminated by a long and 
sharp spine, directed backwards, and finely and closely 
serrated ; the serrations extending upwards along the 
back, for more than two thirds of its extent posteriorly, 
and throughout the whole anterior margin. It is quite 
transparent, of a whitish colour, and shows the body dis- 
tinctly through it, which in some specimens, in particular 
localities, is of a fine, light-red colour. The whole surface 
is finely reticulated, the reticulations being small, and 
closely set. Near the anterior margin, and at the upper 
