134 
BRITISH ENTOMOSTRACA. 
Genus 6 — Pleuroxus.* 
Lynceus, Muller , et audorum . 
Pleuroxus, Baird, Ann. and Mag. Nat. Hist., ii; Trans. Berw. Nat. Club, ii. 
Character. — Anterior margin prominent on upper 
portion, the lower part being truncated, or, as it were, 
cut sharp and straight. First pair of feet very large. 
Beak sharp, curved downwards. 
1. Pleuroxus trigonellus. Tab. XVII, fig. 3. 
Lynceus trigonellus, Muller, Zool. Dan. Prod., No. 2395, 1776 ; 
Entomost., t. 10, f. 5, 6. 
— Latreille, Hist. gen. Crust., 205. 
— • LamarcJc, An. sans Yert., 123, No. 2. 
— Baird, Trans. Berw. Nat. Club, 100. 
— M. Edwards, Hist. Nat. Crust., iii, 387. 
— Koch, Deutsch. Crust., h. xxxvi, t. 1 4. 
Monoculus trigonellus, Gmelin, Linn. Syst. Nat., 3003, No. 63. 
— Manuel, Encyc. meth., vii, 733, No. 63, 
t. 268, f. 24, 25. 
— Fabricius, Ent. Syst., p. 498. 
Pleuroxus trigonellus, Baird, Ann. and Mag. Nat. Hist., ii, 93, t. 3, 
f . 1 3, 1 8 43 ; Trans . Berw. N at. Club, ii, 1 5 1 . 
Shell somewhat triangular-shaped, and transparent; 
gibbous on upper portion of anterior edge for about a 
third of its length, the lower two thirds being truncated, 
or, as it were, cut obliquely with a straight, sharp edge, 
and ciliated. Posterior margin gibbous also, and sinuated 
near lower extremity, which terminates in a square point. 
Beak long and curved, sharp-pointed. Eye areolar. 
Inferior antennae or rami short and slender. The an- 
terior branch has four setae, one from first articulation, 
one from second, and two from last. Posterior branch 
has three setae, all springing from last joint. 
* Prom TrXtvpov, a side ; and sharp. 
