282 Messrs. J. Wood-Mason and A. Alcock on 



to the ridge separating the hard and the soft parts of the 

 sides of the carapace from one another i both gastro-hepatic 

 and cervical grooves are rather more strongly marked than in 

 the preceding species, especially the latter of them, which is 



Fig. 7. 



Aristceus crassipes, $ , natural size. 



accentuated by a slight thickening of the integument imme- 

 diately behind it on each side of the middle line ; neither, 

 Iiowcver, actually indents the dorsal ridge, though both 

 appear to do so from the lateral aspect, as is seen in the 

 accompanying figure. 



The thick and robust first three pairs of chelate limbs 

 present the most marked contrast to the thin and filiform last 

 two ])airs. 



A fine female specimen from Station 116, 405 fathoms. 



Colour in life crimson. 



An equally fine example of the same sex had jnoviouslv 

 been obtained in lat. 6* 29' N., long. 79° 34' E., in 597 

 fathoms. 



ARiST.i:oi'Sis, gen. nov. 

 Aristem, Sp. Bate, ' Challenger ' Macrura, 1888, p. 309 (^non Duvemoy ). 

 Kostrum three-toothed ; carapace without liepntic spine ; 



