256 
BRITISH ENTGMOSTRACA. 
Binoculus gasterostei, Geoffroy , Ins. de Paris, ii, 661, 1762. 
— latreille , Gen. Crustac. et Ins., i, 14. 
Ozoltts gasterostei, Latreille, Hist. Nat. Crust, et Ins., iv, 128, 
t. 29, f. 4, 1802; Diet, d’Hist. Nat. 
Louse of the carp. Baker, Employm. for Microsc., 374, 1. 14, f. 14. 
Louse of the banstickle, Baker, 1. c., 376, t. 14, f. 15. 
Petit insecte aquatique, Ledermuller , Amus. Micros., part i, 76, 
t. 37. 
Monoculus cauda foliacea plana, Loejling, Act. Soc. Beg. Scient. 
Upsal, t. 2, f. a-d. 
Eisch-laus, Frisch, Insect, in Leutsch., vi, t. 10, f. a. 
Monoculus cyprinaceus, Shaw, 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 (JEsooc lucius), 
W. Yarrell, Esq., J. Doubleday, Esq. Salmon-trout, 
Belfast, W. Thompson, Esq. Sticldebaek, Iiighgate Ponds, 
Hammersmith, &c., W. B. 
Family — CALIGIDiE. 
Caligidje, M. Fdwards, Hist. Nat. Crust., iii. 
— Baird, Trans. Berw. Nat. Club, ii. 
Caligidve (pars), Leach, Diet. Sc. Nat., xiv. 
— Bisso, Hist. Nat. Eur. Merid., v, 134. 
— Desmarest, Cons. gen. Crust., 334. 
Caligina (pars), Kroger, Tidsskrift, i, 200 (?). 
— Burmeister, Beitr. zur Naturg. der Bankenfuss., p. 54, 55 (?). 
— Dana, Proc. Amer. Acad. Arts and Sc., 1849, p. 54. 
Character. — Head in form of a large buckler, having 
anteriorly large frontal plates. Pour pairs of feet, which 
are furnished with long plumose hairs. Antennae small, 
