332 
BRITISH ENTOMOSTRACA. 
Males in general differ very much in appearance from 
the females, being greatly smaller and unattached. 
Family LERNEOPODADJE. 
Lerneopodiens {pars), M. Edwards , Hist. Nat. Crust., iii. 
Character. — Arm- shaped appendages long, wide apart 
from each other at their base, and united only at the tip. 
Genus Lerneopoda.* 
Lerneopoda, Blainville, Journ. Phys., xcv, 442, 1822. 
— Kroyer, Tidsskrift, i, 207. 
— M. Edwards, Hist. Nat. Crust., iii, 514. 
— W. Thompson, Ann. Mag. Nat. Hist., xx, 248. 
— Rathke, Nov. Act., xix. 
Lernea, Gisler, Linnaeus, Grant, Retzius, 8fc. 
Character. — Female. Body generally elongated, oval. 
Head short and thick. Two pairs of foot-jaws, well- 
developed, and placed near each other. External ovaries 
of moderate length and cylindrical. 
Male. Body divided into two nearly equal portions of 
an ovoid shape ; one representing the head, the other the 
thorax. Much smaller than the female. 
The genus Lerneopoda was established by Blainville, 
in the ‘Journal de Physique/ in 1822; and was after- 
wards adopted by Nordmann in 1832, Burmeister in 
1835, and Kroyer, in his ‘Tidsskrift/ in 1837 ; but the 
first notice taken of any species appertaining to the genus 
was by Gisler in 1751, who, in the twelfth volume of the 
‘ Acta Suecica/ describes and figures a species of Lernea 
found by him on the salmon, and which he called “ Fedi - 
cuius salmonis or lax-lusen.” f 
Linnaeus, in his ‘Fauna Suecica/ 1761, describes this 
species as the Lerncea salmonea , and repeats it in his 
* Aepvaiog, belonging to Lernea ; and ttovq, foot, 
f “ Salmon louse. 55 
