ISOPODA. 
229 
Serolis, Leach, 
But a single species is known, tlie Cymothoa paradoxa. Fab. 
The antennae are placed on two lines, and terminated by a pluri- 
articulated stem. Under the three first segments of the tail, 
between the usual appendages, there arc three others, trans- 
versal and terminated posteriorly in a point * * * § . 
Sometimes the eyes are lateral and not jilaced on tubercles ; the 
tail is composed of live or six segments. 
Here the organ of sight is not formed of smooth, granular, ap- 
proximated eyes ; the antennae are placed on two lines, and consist of 
seven joints at least ; the six anterior feet are usually terminated by 
a small, stout nail. 
In some, where the tail always consists of six segments, the length 
of tlie inferior antennae never surpassed the half of that of the body. 
A\'e Avill begin with those whose mandibles, as usual, are but 
slightly, or in no degree salient. 
Cymothoa, Fab. 
The antennae nearly equal in length; eyes scarcely apparent; last 
segment of the tail forming a transverse square ; the two pieces ter- 
minating the lateral fins, linear, equal and styliform f . 
IcTiiYOPiiiLus, Lat . — Nerocila, Livoxeca, Leach. 
The antennae, equal in length, and but slightly visible eyes ; the 
last segment of the Imdy almost triangular ; tlie two pieces termi- 
nating the lateral fins in the form of leaflets and laminae, the exterior 
of which is largest in the Nerocilee, and of the size of the other in 
Livoneca J. 
In the four following subgenera the superior antennae are mani- 
festly shorter than the inferior. 
In several, as in Cymothoa, all the feet are terminated by a small, 
stout, and strongly curved nail ; the last eight are not spinous ; tlie 
eyes aji’e always separated and convex. They form three genera in 
the system of Leach, but may be united in a single subgenus, under 
the common denomination of one of them, or the 
Canolira, Leach . — Anilocra, Olencira, Ejusd. 
The lamimc of the fins in the Olencira? § arc narrow and armed 
with spines. In the Anileerce || the external leaflet of the same 
parts is longer than the internal ; the reverse is the case with the 
Canolirae The eyes, besides, are but slightly granulous while in 
the preceding that disposition is evident. 
* For other details consult Desmar., Consid., p. 292 — 294. 
-f- Cymothoa <estrum, Fab. ; Desmar, Consid., XLVI, 6, 7 ; — C. imbricafa, Fab. 
For the other species, see Desmar., loc. cit. 
X See Desfnar., op. cit. p. 307, genera Nerocila and Livoneca, and various species 
of Cymothoie of Risso, p. 310, 311. 
§ Desmar., Consul., p. 30C. 
11 Desmar., Consid., Anilocre du Cap, XLVIll, 1. 
^ Desmar., Consid., p. 305. 
