I8OPODA. 229 



SEROLI*, Leach. 



But a single species is known, the Cymothoa paradoxa. Fab. 

 The antennae are placed on two lines, and terminated l>y a pluri- 

 articulated stem. Under the three first segments of the tail, 

 between the UMUI! appendages, there are three others, trans- 

 ver>.il and terminated posteriorly in a point*. 



Sometimes the eyes are lateral and not placed on ml. .ides; the 

 tail is compo.xed of tive or six Moments. 



Here the organ of sight is not formed of smooth, granular, ap- 

 proximated eyes ; the antennae are placed on two lines, and consist of 

 t lea-4 ; the six anterior feet are usually terminated by 

 a small, stout nail. 



In some, wla-iv the tail always consists of six segments, the length 

 of the inferior antennae never surpassed the half of that of the body. 



We will 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 ; tlie two pieces ter- 

 minating the lateral fins, linear, equal arid styliform f. 



ICTIIYOPIIILUS, Lai. NEROCILA, LIVONECA, Leach. 



The antennae, equal in length, and but slightly visible eyes ; the 

 last segment of the body almost triangular ; the two pieces termi- 

 nating the lateral fins in the form of leaflets and laminae, the exterior 

 hich is largest in the Nerocilae, and of the size of the other in 

 Livoneca \. 



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 ; the 

 eyes a^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 



CANOURA, Leach. ANILOCRA, OLENCIRA, Ejiisd. 



The laminae of the fins in the Olencirae are narrow and armed 

 with spines. In the Anilocrae || 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 Dcsmar., Consid., p. 292 I 



f Cymothoa trstrum, Fab. ; Desmar, Consid., XLYI, 6, 7 ; C. imbricata, Fab. 

 For the other species, see Desmar., loc. cit. 



<r Desmar., op. cit. p. 307, genera Nerocila and Livoneca, and varbus species 

 of CyinothoR of Risso, p. 310, 311. 



Desmar., Coo? id., p. 306. 



|| Desmar., Consid., Anilocre du Cap, XLVI1I, 1. 



ii Desmar., Consid., p. 305. 



