628 CLASS xX. 
bifid, furnished at the longer apex with double seta. Five pairs of 
feet, the two first uncinate, the third and fourth with apex bifid, 
aculeate, the fifth oval, simple. Two small oval appendages at the 
end of the last segment. 
Sp. Dichelesthiun Sturionis Hurm., Caligus oblongus ABILDGAARD, 1. 1. p. 
32, Tab. v. figs. 4—11, HERMANN Mém. aptérol. Tab. V. figs. 7,8, RATHKE 
Nov. Act. Acad. Ces. Carol. Tom. x1x. Part 1. 1839, s. 125—153, Tab. 
xvul. ; this elongated parasitic crustacean fixes itself by its two shear-shaped 
antennz fast to the branchial arches of the sturgeon. 
Lamproglena NorpM. Mouth a truncated tubercle. Antenne 
four subulate ; anterior larger with twelve rings, posterior not arti- 
culate. Ocellus single. Two pairs of uncinate feet; four pairs of 
natatory feet, imperfect, very small. 
Sp. Lamproglena pulchella Norpm., 1. 1. Tab. 1. Minne Epwarps Hist. des 
Crust. Pl. 39, fig. 6. 
B. Body oval or broad, depressed, posteriorly attenuated. Two 
sacciform receptacles of eggs at the base of abdomen. Mouth a 
truncated tubercle. 
Nicothoé Aup. and Epw. Cephalothorax in adults divided by 
a stricture into an anterior cephalic portion, rotundate, small, and a 
posterior portion very broad; sides of cephalothorax produced into 
two wings lobed, inflected backwards. Ocelli two. Antenne two, 
setaceous, small, ten-jointed. ‘Two pairs of uncinate feet. Four 
pairs of natatory feet. 
Sp. Nicothoé Astaci AUDOUIN and Epwarps, Ann. des Sc. nat. IX. 1826, pp. 
345—359, Pl. 49, figs. 1—9; this little animal, which, with its two lateral 
lobes and the two large ovisacs situated behind them, reminds us at first 
sight of a four-winged insect, a little moth for instance, lives on the gills of 
the lobster, and undergoes no such changes as most of the parasites and 
even the monoculi, but has merely a different form of the cephalothorax, 
and two fewer abdominal rings and feet. The male is not yet known, as in 
other genera of this family. Comp. also KRoryeEr 1. |. 1. p. 146, Tab. 111. 
fig. 7, and especially RATHKE Nov. Act. Acad. Leop. Car. xx. 1843, pp. 
102—106, Tab. Vv. figs. :—ro, and VAN BENEDEN Mém. sur le developpement 
et Vorganisation des Nicothoés. Mém. de l Acad. roy. de Belgique. Tom. 
XXIV. ay. une pl. 
Bomolochus Norpm. Antenne two, with basal joint large, 
thick, denticulate above, the rest attenuate, setaceous. Feet bifid, 
setiferous in four pairs. 
