256 BRITISH ENTOMOSTRACA. 



BiNOCULUS GASTEROSTEi, Geoffro!/, Ills, de Paris, ii, 661, 1762. 

 — Latreille, Geu. Crustac. et lus., i, 14. 



OzoLUS GASTEKOSTEi, Latreille, Hist. Nat. Crust, et Ins., iv, 12S, 



t. 29, f. 4, 1802 ; Diet. d'Hist. Nat. 

 Louse of the carp, Baker, Emplojra. for Mierosc., 374, t. 14, f. ]4. 

 Louse op the banstickle, Baker, 1. e., 376, t. 14, f. 15. 

 Petit insecte aquatique, Ledermnller, Amus. Micros., part i, 76, 



t. 37. 

 MoNOcuLUS CAUDA FOLiACEA I'LANA, Loejliiig, Act. Soc. Reg. Scient. 



Upsal, t. 2, f. A-D. 

 FiscH-LAUS, Frisch, Insect, in Deutsch., vi, t. 10, f. a. 

 MoNOCULUS CYPRiNACEUS, SIuiw, Naturalist's Miscellany, xviii, t. 736. 



Description. — The Argulus foliaceus is of a rounded, 

 oval shape, the front of the carapace notched on either 

 side, and bluntly projecting in the centre. It is nearly- 

 transparent, of a slightly greenish hue, and elegantly 

 marked on both sides by a series of ramifications of a 

 darker colour. The female is larger than the male, and 

 is distinguished, in addition to the ovaries, by a black 

 mark on each lobe of the abdomen. The last pair of feet 

 is not concealed by the carapace. 



Hah. — On the carp and banstickle, St. James's Park, 

 Baker. Trout {Salmo fario) and pike {Esox luciiis), 

 W. Yarrell, Esq., J. Doubleday, Esq. Salmon-trout, 

 Belfast, W. Thompson, Esq. Sticldeback, Highgate Ponds, 

 Hammersmith, &c., W. B. 



Family— CALIGID^. 

 Caligid^e, M. Edicards, Hist. Nat. Crust., iii. 



— Baird, Trans. Berw. Nat. Club, ii. 

 Caligid.e {pui-s). Leach, Diet. Sc. Nat., xiv. 



— Risso, Hist. Nat. Eur. Merid., v, 134. 



— Besmarcst, Cons. gen. Crust., 334. 

 Caligina {pars), Kroner, Tidsskril't, i, 200 (?). 



— Burmeister, Bcitr. zur Naturg. der Rankenfuss., p. 54, 55(?). 



— Buna, Proc. Amer. Acad. Arts and Sc., 1849, p. 54. 



Character. — Head in form of a large buckler, having 

 anteriorly large frontal plates. Four pairs of feet, which 

 are furnished with long plumose hairs. Antennae small. 



