242 
' ZOOLOGISCHE MEDEDEELINGEN — DEEL III. 
15 
Mesogastric region of carapace with a median ridge. Anterior 
margin of front with a faint and broad emargination. 
Ses. tiomanensis Rathbun. 
Walking legs slender; meropodites of penultimate pair at least 
2'/, times as long as broad. Mostly small species. 16 
Walking legs shorter, more robust; meropodites of penultimate 
| pair about twice as long as broad. 39 
16 
17 
Epibranchial teeth on either side of carapace, behind external or- 
bital angle, very minute, not prominent, scarcely indicated by a 
thickening of the margin, both of equal shape; sides of carapace 
parallel, at least in their posterior half. Upper border of palm of 
cheliped defined by a longitudinal row of minute granules, that is, 
however, sometimes discontinuous. Postfrontal lobes sharpened ante- 
riorly ; front with nearly straight anterior margin. Walking legs very 
long and slender. 17 
Sides of carapace generally divergent posteriorly, rarely subparal- 
Jel; distance between external orbital angles thus in most cases less 
than breadth of carapace at the level of the penultimate pair of legs; 
external orbital angle always defined posteriorly by a distinct incision, 
so that an epibranchial teeth, of the same general shape as the pre- 
ceding tooth, though generally smaller and less acute, is formed; 
generally a trace of a second epibranchial tooth is present. 18 
Superior and anterior border of arm of cheliped without subdistal 
tooth; outer surface of palm granulated, in the middle of the outer 
surface generally some tubercles unite to form an acuminate, 
prominent knob, that gives a characteristic appearance to the 
palm when looked at from above; upper border of palm with a gra- 
nulated: row, which is, however, often disconnected and interrupted 
at one or more places; upper border of movable finger with a longi- 
tudinal row of 12—16 acute spines with horny-coloured tips in , 
‚with 5—6 sharpened granules only in ©. 
18 
Ses. gracilipes H. Milne-Edwards. 
Superior and anterior border of arm of cheliped with an acute 
tooth; outer surface of palm granulated, regularly convex, upper 
border “traversed, fore and aft ....... by a fine and finely milled 
ridge” (Alcock). Ses. finni Alcock. 
Sides of carapace | subparallel; width of front distinctly 
more than half the distance between external orbital angles. Middle- 
