126 ' BRITISH ENTOMOSTRACA. 



1. Chydorus spHiERicus, Tab. XVI, fig. 8. 



Lynceus sph^kicus, MilUer, Zool. Dan. Prod., No. 2932, 1776; 

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



— Latreille, Hist. gen. Crust., 207. 



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



— Besmarest, Cons. gen. Crust., 377. 



— Baird, Trans. Berw. Club, i, 100. 



— M. Mivards, Hist. Crust., iii, 386. 



— Pritchard, Micros. Cab., t. 8, f. 3. 



— Koch, Deutsch. Crust., h. xxxvi, t. 13 {not 



L viii, t. 2.) 

 MoNOCULUS sPH^Bicus, Gmelui, Linn. Syst. Nat. 3008, No. 60, 



— J/««?/e/,Encyc.nieth.,vii, 732, t. 268, f. 15-17. 



— Fabrickis, Ent. Syst., ii, 497. 



— Jurine, Hist. Monoc, t. 16, f. 3. 

 MoNOCULUS iNFUSOKius (Kleinstcr Schildfioh), Schrank, Enum. Insect. 



Aust., 536. 

 — Eichhom, Beyt. Naturg., t. 3, f. d."^ 



CiiYDORUS MiiLLEHi, Leuch, Enc. Brit. Supp., art. Annulosa, 1816 ; 



Diet. So. Nat., xiv., 511. 

 Chydokus sph^kicus, Baird, Ann. and Mag. Nat. Hist., ii, 89, t. 2, 

 f. ] 1-13,18 43 ; Trans. Berw. Nat. Club, ii, 150. 



Shell round, smooth, slightly ciliated on anterior 

 margin, of an olive green colour. Inferior antennas or 

 rami very short ; anterior branch has four seta?, 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 half 

 another. 



Abdomen jointed, and having two stout claw^s 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 antennae. 



* Perhaps this may be a new species. Milller quotes this figure of 

 Eichhom for his L. trigonellns, but it appears to me to be quite distinct. It 

 resembles the spha-rlcus in shape, except that the inferior extremity of the 

 shell is pointed. Should it prove a new species, we would propose to name it 

 Chydorns Eichhorni. 



