45 



(2) The areolation of the carapace is much less distinct ; the cervical 

 groove, though broad, is quite superficial anteriorly ; the transverse oblique 

 depression subdividing the epibranchial regions can be felt rather than seen ; 

 and though the mesogastric furrow separating the epigastric crests is deep and 

 very distinct and the epigastric areolae are tumid, the sub-divisions of the gastric 

 region are not otherwise perceptible ; 



(3) The front is very much narrower, is vertically deflexed, and though its 

 surface is finely rugulose in places it is not raised into any distinct eminences ; 



(4) The antero-lateral margins are more strongly curved and their serra- 

 tions form a continuous series, not interrupted by a distinct gap, with the 

 external orbital tooth ; 



(5) The legs, though long and slender, are not so long ; the individual joints 

 are not so slender, for instance, in the 2nd and 3rd pairs the propodites are 

 only three and a half times as long as broad. 



Length of carapace little more than two-thirds the greatest breadth, depth 

 little more than two-fifths the length. 



Cai'apace decidedly convex behind the frontal slope ; the gastric region is 

 well defined as is the tip of the mesogastric sub-region, but there is no other 

 distinct areolation. On the antero-lateral part of the epibranchial regions there 

 are oblique lines of granules and a few small tubercles ; similar oblique lines of 

 granides cover the side-walls of the carapace, but the well-defined sub-orbital 

 lobes and the pterygostomian regions are almost smooth ; and the dorsum of 

 the carapace inside the epibranchial striae is very smooth. The cervical groove 

 is deep-cut posteriorly, but broad and very superficial anteriorly, except where 

 it breaks through the post-orbital crests at the usual spot in line with the inner 

 angle of the external orbital tooth. 



Front narrow, not one-fourth the greatest breadth of the carapace in the 

 adult, very strongly deflexed, square-cut, its edge well-defined and faintly 

 sinuous. Upper edge of orbit sinuous. External orbital tooth well defined, 

 separated from the lower border of the orbit by a deep gap. 



Antero-lateral margins of carapace hardly as long as the postero-lateral, 

 strongly arched, cristiform, and rather irregularly serrulate ; lateral epibranchial 

 tooth distinct, but the gap between it and the orbit is not conspicuous above the 

 neighbouring inter serrations. Postero-lateral borders markedly convergent aft, 

 crossed by a few very fine strife. 



Epigastric crests separated from the post-orbital crests by a short notch 

 and almost in the same straight line with the post-orbital crests ; both sets of 

 crests are well defined and have a finely rugulose edge. 



Antennular fossae narrow ; so strongly deflexed is the front that their 

 opening is horizontal. Basal (true 2nd) antennal joint short and broad, the 

 succeeding joints covered by the front. 



