CRUSTACEA. 



166 



™-ly subgenera of the genus Xanthus. Through Xanthodes there 

 E, a P~ to the narrow form in Pilumnus; yet the spe.es as m 

 othe Xanthi, have the male abdomen always five-jomted. Though 

 P.raxanthus has the first basal joint of the outer antenna) quite short, 

 the front does not send down a narrow process to meet *; and m this 

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

 produced front, it differs from Xanthocles. 



Subgenus XANTHO. 

 1. Pedes 8 postici rristati. 



Xantho nitidus. 



Carapax lawis, paula nitidus, ant fed part irn leviter areolatus, areolisZM, 

 5X §L,postkh vix circumscriptis; /route fire recto, ,«>,< enmrgmato, 

 man/ine antero-laterali leviter 3-4-Zotao, lolls subtriavgidatls, angulo 

 orUtali externa nan saliente. Pedes ant lei subceqid, inermes, fire laces 

 (subtilissimd corrugate), mmiubene crktatd, dlglio mobili subcristato 

 et dente hasali magna carente. Pedes 8 postici bene crlstati, fire nud% 

 margimbus integris, apice marghuque infcrlore articuli 5// hreeUmme 

 hirsuto-villosis, tarso supra iu/reiquc etlam vllloso. 



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 taint 3-4-lobed, 

 lobes subtriangulate, outer orbital angle not salient. Anterior feet 

 subecpial, 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 : 1*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 



