ISOPODA. 
Crust . 23 
in Cymothoa , as it is also in the following genera. T. henseli (Martens, 
as Cymothoa ) and lunaris, sp. n., both on fresh-water fishes of Brazil, the 
latter in the gill cavity of Sternarchus ; Schiodte‘<% Meinert, pp: 886-292, 
pi. x. figs. 11-14. 
Enispa, g. n. Distinct from, the preceding by the subcylindrical plion. 
E. triangularis (Bleeker, as Cymothoa ), Indian Sea ; pp. 292-297, pi. xi. 
figs. 1 & 2. 
Ichtliyoxenus jellinghausi (Herklots). Male and female together in a 
pouch of the belly behind the ventral fins on Puntius maculatus , Java, 
and montanus , sp. n., Himalaya, on Puntius sophore ; pp. 297-309, pi. xi. 
figs. 5-17. 
Catocssa, g. n. Distinct by an obconical plion from the preceding, in 
which it is constricted at the base ; body in both rather flat. C. scabri - 
cauda (Mus. Berolin, MS.), sp. n., Adenare Island, near Flores, Malayan 
Archipelago ; pp. 309-311, pi. xii. figs. 1 & 2. 
Cinusa , g. n. First pair of antennas less distant one from the other 
than in Cymothoa , and segment much shorter than all the preceding 
segments of the plion together. C. tetrodontis , sp. n., in the mouth of 
Tetrodon honckeni , Cape of Good Hope, Indian and Pacific Sea; 
pp. 311-318, pi. xii. figs. 3-7. 
j R hinorthra, g. n. Anal segment larger than all the preceding segments 
of the plion together; first antennae as in the preceding. R. callipia, 
sp. n., Indian Sea; pp. 318-324, pi. xii. figs. 8-13. 
A third tribe, Livonecince , has compressed antennae, the first pair 
distant at the base from one another, the plion forming a continuous 
outline with the perion, but deeply immersed in it, and a rather convex 
body. To this, belong the following genera : — 
Agarna ) g. n. Body gibbous, the last segments flattened and dilated 
only on one side. A. carinata , sp. n., St. Croix, on Acanthurus chirurgus ; 
pp. 328-334, pi. xiii. figs. 1-6. 
Idusa , g. n. Body compressed, last segments convex. I. plagusice , 
sp. n., West Indies, on the blind side of the Pleuronectid genus Plagusia ; 
pp. 334-336, pi. xiii. figs. 7 & 8. 
Elthusa, g. n. Body rather flat, front rounded. E. emarginata (Bleeker, 
as Livoneca), Indian Seas, beneath the gill-cover of Upeneus\ pp. 337-340, 
pi. xiii. figs. 9 & 10. 
Livoneca (Leach). 12 species previously characterized, 2 fully de- 
scribed, including panamensis , sp. n. ; pp. 340-352, pis. xiii. figs. 11-14, 
& xiv. fig. 1. 
Irona , g. n. Distinct from Livoneca by the very deeply immersed plion ; 
p. 325. 
Cterissa, g. n. Front rather sharply angulated; p. 325. 
Artystone (Schiodte, 1866). Distinct from all preceding by the last pair 
of feet being much longer than the others, with rather straight claws ; 
p. 325. 
Urozeuktes (M.-Edw.) belongs also to this tribe ; p. 325. 
The paper ends abruptly in the middle of a special description of 
Livoneca , and the above genera following it are taken from the introduc- 
tory table. 
