32 
BRITISH ENTOMOSTRACA. 
as British. He read a paper before the Linnean Society 
in April 1807, which is printed in vol. xi of their 
4 Transactions / in which he describes and figures a spe- 
cimen found by him in Devonshire. He refers it to the 
Linnean genus Monoculus, under the name of Monoc. 
rostratus , and says it is the largest species of that genus 
he had ever found in England. 
Dr. Leach, in his 4 Naturalises Miscellany/ vol. i, 
p. 99, published in 1814, describes it more fully than 
Montagu, and says the species he describes is not un- 
common on the south-western and western coasts of 
England. As he saw that it constituted a very distinct 
genus from any previously given by modern writers, 
he formed the genus Nebalia to receive it, and adds, 
44 in a systematic work this genus would hold a very 
conspicuous and important place, as it is not refer- 
able to any family hitherto established/’ In a paper 
published soon afterwards by him, in vol. xi of the 
4 Linnean Transactions/ on the Arrangement of the 
Crustacea, he assigns its place amongst the Malacostraca, 
in the order Macroura; in which he is followed by 
Lamarck, Bose, and Desmarest, Latreille, Olivier, and 
Bisso ; the three latter authors, however, referring the 
species described to the genus Mysis. 
We are indebted to M. Edwards for a more detailed 
anatomical account of this interesting genus, and its true 
place in the systematic arrangement. In a paper pub- 
lished by him in the 4 Ann. des Sc. Nat., t. xiii, 1828, 
he shows from its structure, which we shall describe 
shortly, that it does not belong to the Decapoda Macroura, 
but in reality must be placed amongst the Branchiopoda ; 
an opinion which he confirms in the 4 Ann. des Sc. Nat./ 
2d series, t. iii, 1835, and in his work upon the Crustacea, 
where he says it constitutes a passage between Mysis and 
Apus. The details given in these papers with regard to 
its anatomical structure, and the fact long ago mentioned 
by the first observer of the genus, O. Eabricius, that it 
carries its eggs under the body during the winter, and 
