38 
BRITISH ENTOMOSTRACA. 
and Ronndstone 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 Nebalia bipes. 
As the name of Iierbstii 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 law of 
priority, to restore its original designation. 
Hab . — 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 — BRANCHIPODIDiE. 
Branchipiens, M. Edwards, Hist. Nat. des Crust., iii, 364. 
Branchiopoda, Leach , Diet, des Sc. Nat., xiv. 
Branchiptjsid^e, Baird , Trans. Berw. Nat. Club, 1845. 
Branchipldje, Burmeister, Organiz. of Trilobites, Ray Soc. 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 . Chirocephalus. — 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. 
