628 CLASS x. 



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 HERM., Caligus ollongus ABILDGAARD, 1. 1. p. 

 32, Tab. v. figs. 4 ii, HERMANN Mem. apterol. Tab. v. figs. 7, 8, RATHKE 

 Nov. Act. Acad. Cces. Carol. Tom. xix. Part I. 1839, s - I2 5 T 53> Tab - 

 XVII. ; this elongated parasitic crustacean fixes itself by its two shear-shaped 

 antennae fast to the branchial arches of the sturgeon. 



Lamproglena NORDM. Mouth a truncated tubercle. Antenna) 

 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 pulckella NORDM. ; 1. 1. Tab. I. MILNE EDWARDS 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. 



Nicothoe AUD. and EDW. 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. Antennae two, 

 setaceous, small, ten-jointed. Two pairs of uncinate feet. Four 

 pairs of natatory feet. 



Sp. Nicothoe Astaci AUDOUIN and EDWARDS, Ann. des Sc. nat. ix. 1826, pp. 

 345 359, PI. 49, figs, i 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 yjet known, as in 

 other genera of this family. Comp. also KROEYER 1. 1. n. p. 146, Tab. ill. 

 fig. 7, and especially KATHKE Nov. Act. Acad. Leop. Car. xx. 1843, PP- 

 102 1 06, Tab.v. figs, i jo, and VAN BENEDEN Mem. sur le developpement 

 et V organisation des Nicothoes. Mem. de I' Acad. roy. de Belgique. Tom. 

 xxiv. av. une pi. 



Bomolochus NORDM. Antenna3 two, with basal joint large, 

 thick, denticulate above, the rest attenuate, setaceous. Feet bifid, 

 setiferous in four pairs. 



