332 BRITISH ENTOMOSTRACA. 



Males in general differ very much in appearance from 

 the females, being greatly smaller and unattached. 



Family LETINEOPODAD.E. 

 Lerneopodiens {pars), 31. 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. Pliys., xcv, 442, 1822. 



— Kroi/er, Tidsskrift, i, 207. 



— j\I. Edwards, Hist. Nat. Crust., iii, 514. 



— IF. Thompson, Auu. Mag. Nat. Hist., xx, 248. 



— RafhJce, Nov. Act., xix. 

 Leen^a, Gisler, Linntcus, Grant, Retzius, ^-c. 



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 w^as established by Blainville, 

 in the 'Journal cle Physique,' in 182.2; 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 "Pedi- 

 culus salmonis oy LaT-lusen!'^ 



Linna3us, in his 'Fauna Suecica,' 1761, describes this 

 species as the Lerncea sahnonea, and repeats it in his 



* AtpvaioQ, belonging to Lei'nea; and -jtovs, foot. 

 f " Salmon louse." 



