1901..] CRUSTACEA Or XUE "8KHA.T EXPEDITION." -5-">7 



inner uropodal joint. It resembles it in the general smoothness of 

 the chelipedes, the length of the telson, and apparently the shape 

 of the propodite of the 3rd pair of legs (t. e. p. 482, " Das vorletzte 

 died des dritten Fusspaarer ist oval.") 



Length of animal 31*5 mm. ; length of carapace 7*25 mm. 



XXXYI. Genus Arctus; Dana. 

 61. Arctls tubercllaits Sp. Bate. 



Arctus tuberculatum, Sp. Bate, ' Challenger ' Macrura, p. 70, 

 pi. x, figs. 1-2 (1888). 



Loc. Kelantan. 



A male and a female, quite agreeing in general with the original 

 description and figure ; but the following points may be noted : — 

 The tubercle on the 3rd abdominal segment is not quite so clearly 

 separated from its base as it is in Spenee Bate's figure ; the coxal 

 plates of abdominal segments 3-5 bear a low ridge, lying trans- 

 versely to the long axis of the body — this is found down the middle 

 of the plate in segment 5, but in the anterior half in segments 3-4, 

 and divides an anterior smooth from a posterior, short-hairy, 

 siuface. The smooth anterior surface plays under the posterior 

 surface of the preceding segment, and the riclge determines the limit 

 within which this play is possible in complete flexion of the tail. 

 In the 2nd abdominal segment this ridge is represented by a short 

 line of low tubercles, and the whole surface is hairy. 



XXXVII. Grenus Tiie>t's Leach. 



02. In lacs oriexxalis Fabr. 



Scyllarus orientalis, Fabr. But. Syst., Suppl. p. 399 (1798); 

 Milne-Edwards, Hist. Nat. Crust, ii. p. 286 {1837). 



Loc. Kelantan ; Trengganu. 



Two males and a female ; all three are infested with a stalked 

 Cinipede on the mouth-parts, notably on the exopodites of the 2nd 

 maxillipedes. This Cirripede belongs to the genus Dichdaspis, and 

 will be described, as a new species of that genus, in the second 

 part of this paper. 



Length: J 131mm., rf 120mm., $ 101 mm. 



XXXVIII. Genus Sjmtex Pfeffer. 



63. Si. M.v oKXAii s Fabr., var. now l.kvis. 



Of. Senex ornatus, Ortmann, Zool. Jahrb. vi. p. 31 (1892). 



/../.-. Siogora. 



One fult-grown male, just over I fool in length. 



Although undoubtedly referable in this speciea, this specimen 

 presents such well-marked differences thai I bave though! l6 worth 

 while detailing fhem and attaching a varietal name thereto. The 

 amount of variation in the species of tins genus i- - vidently \<n 



Paoc. Zool. So< I Ml, Vol. 1 1. No. XXXVI I. 37 



