104 BRITISH ENTOMOSTRACA. 



Intestine straight, not convoluted ; but more distinctly 

 curved at its upper extremity than in the other Daphniadae. 



Hah. — Pond at Southall, Middlesex, June 1841; 

 Sept. 1849. Pond at Highgate, July 1842; Sept. 1849. 

 Belfast, May 1849, W. Thompson, Esq. 



2. Macrothrix roseus. 



MoNOCULUs ROSEUS, Jtirine, Hist. Monoc, t. 15, f. 4,5. 

 Lynceus roseus, Desmarest, Cons. gen. et part., 376, t. 54, f. 8-9. 

 Daphnia rosea, M. Edwards, Hist. Nat. Crust., iii, 384, No. 14. 



— Yarrell, British Fislies, ii, 93, vignette. 



Macrothrix roseus, Baird, Trans. Berw. Nat. Club, ii, 149. 



This species differs very little from the preceding. The 

 shell or carapace is smooth, and very transparent ; an- 

 teriorly it is ciliated. The superior antennae are longer 

 and narrower than in laficornis, and are fm'nished with 

 three very short setse at their extremity. The eye is con- 

 siderably smaller, and has no areola round it. The colour 

 of the whole animal is of a rosy hue. Eggs two. 



It swims horizontally ; and when it bounds through 

 the water, the motions of its arms are soft and graceful. 

 It forms great part of the food of the Vendace [Corre- 

 (jon us WiUii(jli bii) . 



M. Edwards considers this and the preceding to be 

 the same species. 



Hab. — Lochmaben Loch, Dumfriesshire, Sir W. 

 Jardine, Bart., W. Yarrell, Esq. 



As I have not seen this species, I have not figured it. 

 It may tnrn out to be only a variety of the preceding, if 

 not exactly the same. 



