DAPHNIA. 
99 
network, of small, irregular pentagonal cells. The colour 
is generally somewhat red. The sixth segment of the 
body is destitute of the spur which is found in the reticu- 
lata. The ova are more numerous. The whole animal 
is larger, and it possesses a greater density of structure. 
Hab. — Ponds and ditches in the neighbourhood of 
London, during summer and autumn. 
7: Daphnia mucronata. Tab. X, figs. 2, 3. 
Daphne mucronata, Muller , Zool. Dan. Prod., No. 2404, 1776. 
Daphnia mucronata, Muller , Entomost., 94, t. 13, f. 5, 6. 
— Desmarest , Cons. gen. Crust., 374. 
— Latreille , Hist. Nat. Crust., iv, 229. 
— Bose , Man. d’Hist. Nat. Crust, ii, 281. 
— M. Edwards, Hist. Nat. Crust., iii, 382. 
— Baird , Trans. JBerw. Nat. Club, ii, 148. 
Monoculus mucronatus, Gmelin, Linn. Syst. Nat., edit. 13th, i, 3000, 
No. 28. 
— Manuel, Enc. meth., t. 265, f. 19. 
— Jurine, Hist. Nat. Monoc.,137,t.l4,f.l, 2. 
Monoculus bispinosus, Be Geer, Mem. servir Hist. Ins., vii, 463, 
t. 28, f. 3-8, 1778. 
— Fabricius, Ent. Syst., ii, 493. 
Daphnia bispinosa, Koch, Deutsch. Crust., h. viii, t. 1. 
This species is readily distinguished by the anterior 
edge of the shell being quite straight, and terminating 
interiorly by a spinous point of considerable length. 
The head is of a triangular shape, and the eye is large. 
Superior antennae short. 
Filaments of inferior antennae not plumose. 
The back is impressed with a deep indentation at the 
root of the head ; and the anterior margin is marked with 
brownish coloured bands, and densely ciliated. 
The colour of the whole animal is of a dark gray. 
The form of the head varies in this species, being 
sometimes rounded, and at others terminated by a sharp, 
somewhat curved point directed upwards. 
