32 BRITISH ENTOMOSTRACA. 



as British. He read a paper before the Linnean Society 

 in April 1807, which is printed in vol. xi of their 

 c 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. 

 rosfrafus, and says it is the largest species of that genus 

 he had ever found in England. 



Dr. Leach, in his ' Naturalist's 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, 

 " 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 

 ' 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, Bosc, and Desmarest, Latreille, Olivier, and 

 Risso ; 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 'Ann. des Sc. Nat., t. xiii, 1828, 

 he shows from its structure, which we shall describe 

 shortly, that it does not belong to the Dccapoda Macroura, 

 but in reality must be placed amongst the Branchiopoda ; 

 an opinion which he confirms in the 'Ann. desSc. 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. Fabricius, that it 

 carries its eggs under the body during the winter, and 



