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 ephippiam 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 yoimg 

 hatched. These perfectly resembled the adults, in the 

 shape of the head, &c. 



Hab. — Pond on Blackheath ; April, June, Sept. 1848. 



3. Daphnia ScH(EFFERi. Tab. VII, figs. 1, 2 ; Tab. VIII, 



figs. A 1. 



Geschwanzten zackigek Wasserfloh, Scha-ffer, Die griinen Arm- 

 Polyp., t. 1, f. 8, 1755. 

 Bkanchipus coNCHiFOEMis PKiMUS, Schopffer, Element. Entomol., 



t. 29, f. 3-4. 

 Daphnia pulex, Koch, Deutsch. Crust., b. xxxv, t. 15. 

 Daphnia, Rymer Jones, Outliues of Auimal Kingdom, 330, f. 155. 

 — Kichhorn, Bejtrage zur Naturg., t. 5, f. H (after Schceffer). 



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 colom*, 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 



