38 BRITISH ENTOMOSTRACA. 



and Roundstone Bays, in the west of Ireland, in July 

 1840, and which were kindly lent me by that gentleman 

 for examination, agree remarkably well (with the excep- 

 tion of the number of feet, which were four pairs) with 

 the figure of Fabricius. As that naturalist was the first 

 observer of the species, it is but justice to restore to it 

 the specific name given by him, and call it Nelalia Mpcs. 

 As the name of Hcrbstii was given it by Leach, evidently 

 from a mistaken notion that Herbst was the first observer, 

 and as that author in reality only reproduces in his work 

 the figure previously given by Fabricius, it is still further 

 a matter of justice, and in accordance with the la\v of 

 priority, to restore its original designation. 



Hal. Coast of Devonshire, Montagu ; south-western 

 and western coasts of England, Leach (British Museum) ; 

 Clifden and Roundstone Bays, west coast of Ireland, 

 W. Thompson, Esq., 1840 ; Shetland Isles, R. M 'Andrew, 

 Esq., 1847. 



Family 3 BBANCHIPODULK 



BKANCHIPIENS, M. E<lt<-<n-ilx, Hist. Nat. des Crust., iii, 364. 

 BKANCHIOPODA, Leach, Diet, des Sc. Nat., xiv. 

 BRANCH i rt;siih, Baird, Trans. Berw. Nat. Club, ISio. 

 BKANCniPiD.E, Burm-eister, Orgauiz. of Trilobites, BaySoc. edit., p. 34. 



Character. Body not inclosed within or covered by a 

 carapace of any kind. Two pairs of antennae, the inferior 

 being prehensile in male ; eyes two, pedunculated ; feet 

 11 pairs ; all branchial. 



This family contains two British genera, Chirocephalus 

 and Artemia, closely allied to each other. 



1. CIIIROCEPHALUS. Tail formed of two well-developed 

 plates; inferior antennae or cephalic horns, in male, 

 cylindrical, and provided at their base with fan-shaped 

 and digitiform appendages. 



2. ARTEMIA. Caudal segment of body, simply bilobed, 



