64 8 CLASS x. 



Urozeuctus (Ourozeuktes EDW.). Tail undivided, with segments 

 coalesced. 



Cymothoa nob. Tail composed of six segments, distinct, moveable. 



Sub-genera: Cymothoa LEACH, Livoneca LEACH, Anilocra LEACH, EDW. 

 (Anilocra and Canolira LEACH), Nerocila LEACH, EDW. Comp. W. E. 

 LEACH, 1. 1. 



These animals live parasitically on different fishes. The young animals 

 have a larger head, the eyes more conspicuous, a pair of feet less on the trunk, 

 and a long abdomen. See MILNE EDWAKDS Ann. des Sc. nat., sec. Serie, 

 Tom. in, Zool. PI. 14, fig. 3. 



Sp. Cymothoa oestrum LEACH (Oniscus oestrum L. in part), DESMAR. Crust. 

 PL 47, figs. 6, 7, Cuv. R. Ani. ed. ill., Crust. PI. 65, fig. i ; in the Baltic ; 

 Cymothoa Banksii LEACH, MILNE EDWARDS Ann. des Sc. nat. 1. 1. figs. 

 i, 2 (copied in GUERIN Iconogr., Crust. PL 29, fig. 2, under the name of 

 Cymoth. trigonocephala), from the Cape of Good Hope, &c. 



Alitropus EDW. Antennas not covered at the base, setaceous. 

 All the feet of trunk slender, terminated by a hook. Eyes two, 

 marginal. 



Sp. Alitropus typus MILNE EDWARDS, Hist. nat. des Crust. PI. 33, fig. i ; 

 from the bay of Bengal. 



LEACH. Antennas not covered at the base, anterior with 

 basal joints broad, plane and apex setaceous, multiarticulate. 



Sub-genera : Pterelas GUERIN, Rocinela LEACH ; with eyes large, 

 contiguous, or confluent anteriorly. 



Comp. GUERIN Magasin de Zool. 1836, Crust. PL 20. 



Sp. JEga emarginata LEACH, DESMAR., Crust. PL 47, figs. 4, 5; ^Ega, 

 bicarinata LEACH, RATHKE JBeitr. zur Fauna Norwegens, Tab. vi. figs, i 

 1 8, pp. 2535. 



Cirolana LEACH. 



Eurydice LEACH, EDW. (Eurydice and species of Nelocira LEACH). 



Serolis LEACH. Antennae four, long, not covered at the base, 

 with basal joints thicker, setaceous at the apex. Eyes two, large, 

 reniform, situated in a tubercle, remote from the margin of head. 

 Trunk broad, marked by a longitudinal furrow on each side. 

 Abdomen with only three or four segments distinct, the last very 

 large. Feet of the first pair (or in males, of first and second) thick, 

 short, with strong incurved hook. 



