126 BRITISH ENTOMOSTRACA. 



1. CHYDORUS SPH^RICUS. Tab. XVI, fig. 8. 



LYNCEUS SPH^ERICUS, Mutter, Zool. Dau. Prod., No. 2932, 1776; 



Entomost., 71, t. 9, f. 7-9. 

 Latreille, Hist. gen. Crust., 207. 

 Lamarck, An. s. Vert., v, 128, No. 3. 

 Desmarest, Cous. gen. Crust., 377. 

 Baird, Traus. Berw. Club, i, 100. 

 M. Edwards, Hist. Crust., iii, 386. 

 PritcJiard, Micros. Cab., t. 8, f. 3. 

 Koch, Dcutsch. Crust., h. xxxvi, t. 13 (not 



h. viii, t. 2.) 

 MONOCULUS SPH^ERICUS, Gmelin, Linn. Syst. Nat. 3008, No. 60. 



Manuel, Encyc.meth.,vii, 732, t. 268, f. 15-17. 

 Fabricius, Eut. Syst, ii, 497. 

 Jurine, Hist. Monoc., t. 16, f. 3. 

 MoNOCULUSiNFUSORius(KleuisterScbildfloh),/S'^r/-,Eiaim. Insect. 



Aust., 536. 



EiMorn, Beyt. Naturg., t. 3, f. d* 

 CHYDORUS MUXLEKI, Leach, Euc. Brit. Supp., art. Aunulosa, 1816 ; 



Diet. Sc. Nat., xiv., 541. 



CHYDORUS SPH^RICUS, Baird, Ann. and Mag. Nat. Hist., ii, 89, t. 2, 



f. 1 1-13,1843 ; Trans. Berw. Nat. Club, ii, 150. 



Shell round, smooth, slightly ciliated on anterior 

 margin, of an olive green colour. Inferior antennae or 

 rami very short ; anterior branch has four set<r, three 

 springing from the extremity of the last articulation, 

 and one from the extremity of the second ; poste- 

 rior branch has only three from the last joint. Intestine 

 convoluted, having one complete convolution and halt' 

 another. 



Abdomen jointed, and having two stout claws at its 

 end; the intestine passing through the joint, and termi- 

 nating in the anus near the claws. 



Eye areolar ; its accompanying black spot pretty large, 

 and situated just above the root of the superior antenna'. 



* Perhaps this may be a new species. MiilliT quotes Iliis figure <>!' 

 Eichhnni lor his A. (i-i</<j,/fll/ix, but. il .-ippcars to me to lie quite distinct. It 

 resembles the K/ilm wV/'.v in shape, except that the inferior extremity of the 

 slu II is pointed. Should it prove a uc\v species, \vc would propose to name it 



l-'.x-llhurili. 



