136 BRITISH ENT0M0STRACA. 
/> : ■ /’• • ‘ A 
3. Pleuroxus hamatus. Tab. XVII, fig. 5. 
Lynceus hamatus, Baird, Trans. Berw. Nat. Club, 100, t. 2, f. 18, 1835. 
Pleuroxus hamatus, Baird , Ann. and Mag. Nat. Hist., ii, 94, t. 3, 
f. 14, 1843; Trans. Berw. Nat. Club, ii, 151. 
About half the size of the preceding species. 
Shell truncated anteriorly, and ciliated; extremely trans- 
parent ; upper part gibbous. 
Beak blunter and stronger than in trigonellm. 
Inferior antennae or rami with three setae in each 
branch. 
Abdomen gibbous, not serrated, terminated by two 
claws or hooks. 
First pair of feet large, each furnished at extremity with 
a strong claw or hook turning upwards. 
Intestine convoluted.* 
Hab. — Yetholm Loch, and pool on Bowmont Water, 
near Yetholm Bridge, Roxburghshire, July 1835. 
Genus 7 — Peracantha.I 
Lynceus, Muller , et audorum. 
Peracantha, Baird , Ann. and Mag. Nat. Hist., ii. 
Character. — Oval-shaped ; the lower extremity of shell 
slightly curved backwards, and, as well as the upper ex- 
tremity of anterior margin, beset with strong, hooked 
spines. Beak sharp, curved downwards. 
* I have only once met with this species. It may perhaps be the male 
of trigonellus , the cheliform nature of the first pair of feet having a consi- 
derable resemblance to the structure of that organ in the male Daphnia, 
and more especially in the male of the Estheria, as represented by Joly in 
his description of the Isaura cydadoides, ‘Ann. Sc. Nat./ 2d series, xviii, 1843. 
f Prom 7 rtpag, extremity; and aicavOa , spine. 
