10 
11 
13 
14 
’s RIJKS M USEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 253 

Proximal slope of the said transverse tubercles shorter than 
distal one. 18 
Both fingers of cheliped at base of outer and inner surface and 
along cutting margins with numerous short hairs; upper border of 
movable finger with 4—5 elongated, longitudinal, oval tubercles, 
each of which is finely and transversely milled. Ses. catenata Ortmann. 
Cheliped not hairy; tubercles at upper border of moyable finger 
separated from each other and transverse. 11 

Upper border of movable finger of cheliped with 9—10 tubercles 
in co ({—8 in Q), that are smooth, rounded off. Dactyli of wal- 
king legs only a third of the length of the very much 
elongated and slender preceding propodites. 
Ses. leptosoma Hilgendorf. 
Dactyli of walking legs longer, not very much shorter than the 
preceding joints. 12 
Pectinated ridge near upper border of palm of cheliped one, run- 
ning obliquely-longitudinal, not nearly transverse; tubercles at upper 
border of movable finger 7 in the proximal half, “each one is divided 
by a transverse line into a large proximal, and a small tuberculiform 
distal portion” (Rathbun). Ses. dumacensis Rathbun ').: 
Pectinated ridges near upper border of palm of cheliped generally 
two, running obliquely-transyerse. 13 
Inner surface of palm of cheliped with a transverse crest (in 
adult cj at least) or with a row of granules. 14 
Inner surface of palm of cheliped without trace of a transverse 
crest. 16 
Tubercles at upper border of movable finger 12—13 in o& (9— 
10 much smaller ones in Q), the proximal slope of which is trans- 
versely vaulted and provided with 3-—-4 somewhat prominent, trans- 
verse ridges, the distal slope has likewise 2—3 of these ridges. Mero- 
podites of penultimate pair of walking legs broadened, twice as long 
as broad. Ses. calypso de Man *). 
1) Of this species only the Q is known, and it cannot be said whether in the ~¢ also only 
one pectinated ridge is found on the palm of the cheliped; frequently in the © of Parasesarma 
these pectinated ridges are greatly reduced in size, especially the hind one, and may be 
replaced even by granulate rows. 
2) The subspecies ‘iikenthali de Man is distinguished by a smaller number of tubercles 
(only 9 in the “), that are larger, and provided with 5—6 transverse ridges; moreover the 
transverse row of granules at the inner surface of the palm is quite absent. 
