152 
BRITISH ENTOMOSTRACA. 
1. Cypris tristriata. Tab. XVIII, figs. 1 , 1 a-i; 2, 3. 
Cypeis teisteiata, Baird, Trans. Berw. Nat. Club, i, 99, t. 3, f. 13, 
1835 ; and ii, 152. 
Cypeis pubeea, Baird, Mag. Zool. and Bot., i, 524, t. 16, f. 1-13. 
Shell of an oval form, and somewhat reniform ; the 
valves convex, and of a green colour, more or less deep. 
The anterior portion is of a deep green, immediately 
behind which is a portion of a lighter colour ; the pos- 
terior part is of a less deep green^ and has three narrow 
bands or streaks, two of which are of a much deeper hue, 
running obliquely across it. The whole shell is covered 
with dense, short hairs. 
In some specimens, generally the largest, the shell is 
of nearly a dirty black colour, from the dirt which adheres 
to it obscuring the marks which distinguish the species. 
Nearly in the centre of each valve is to be seen a congeries 
of about seven small, lucid spots. The filaments of both 
pairs of antennae are beautifully plumose. 
Hab . — Berwickshire ; near London, &c. ; not un- 
common, all the summer months. - 
2. Cypris vidua. Tab. XIX, figs. 10, 11. 
Cypeis vidua, Muller, Zool. Dan. Prod., No. 2384, 1776 ; Entomos- 
traca, 55, t. 4. f. 7-9. 
Latreille, Hist. Nat. Crust., iv, 245. 
Bose, Man. d’Hist. Nat. Crust., ii, 297. 
JDesmarest, 385, t. 55, f. 4. 
Baird, Mag. Zool. and Bot., i, 133, t. 5, f. 1 ; Trans. 
Berw. Nat. Club, ii, 152. 
M. Edwards, Hist. Nat. Crust., iii, 399, t. 36, f. 4. 
Monoculus viduus, Gmelin, Linn. Syst. Nat., 3002, No. 42. 
Manuel, Enc. meth., vii, 726, No. 36, t. 264, 
f. 24-26. 
Jurine, Hist. Nat. Monoc., 175, 1. 19, f. 5, 6. 
Bees , Cyclopaedia, art. Monoculus. 
Monoculus viduatus, Fabricius , Ent. Syst., ii, 496. 
Shell of an oval form, a little sinuated on under margin, 
