CRUSTACEA. 



properly subgenera of the genus Xanthus. Through Xanthodes there 

 is a passage to the narrow form in Pilumnus; yet the species, as in 

 other Xanthi, have the male abdomen always five-jointed. Though 

 Paraxanthus has the first basal joint of the outer antennas quite short, 

 the front does not send down a narrow process to meet it; and in this 

 particular, as also the expanded and rounded sides of the carapax, and 

 produced front, it differs from Xanthodes. 



SUBGENUS XANTHO. 

 1. Pedes 8 postici cristati. 



XANTHO NITIDUS. 



Carapax Icevis, paulo nitidus, antice" partim leviter areolatus, areolis 2 M, 

 5 L, 6L, posticd vix circumscriptis ; fronte fere recto, non emarginato, 

 margine antero-laterali leviter 3 4^-lobato, lobis subtriangulatis, angulo 

 orbltali externo non saliente. Pedes antici siibcequi, inermes, fere Ia3ves 

 (subtilissime corrugates), manu bene cristatd, digito mobili subcristato 

 et dente basali magno carente. Pedes 8 postici bene cristati, fere nudi, 

 marginibus integris, apice margineque infenore articuli 5ti brevissime 

 hirsuto-villosis, tarso supra infraque etiam villoso. 



Carapax smooth, a little shining, anteriorly in part faint areolate, 

 areolets 2 M, 5 L, 6 L, hardly circumscribed behind; front nearly 

 straight, not emarginate, antero-lateral margin faint 3-4-lobed, 

 lobes subtriangulate, outer orbital angle not salient. Anterior feet 

 subequal, unarmed, nearly smooth (very minutely corrugate) ; hand 

 neatly cristate, moveable finger subcristate, not having a large 

 inner tooth. Eight posterior feet neat cristate, nearly naked, 

 margins entire, apex and under margin of fifth joint very short 

 hirsute, villous, tarsus above and below villous. 



Plate 8, fig. 4 a, male, enlarged three diameters; b, abdomen of 

 male. 



Feejees or Tongatabu. 



Length of carapax of male, 3'2 lines; greatest breadth, 5 lines; 

 ratio of length to breadth, 1 : l - 56. The areolets 2 F are distinct, 

 also the anterior or outer limits of 1 M, 2 L, 4 L ; 2 L and 3 L are not 



