’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 231 
Ses. (Ses.) sylvicola de Man. 
“Ses. (Ses.) taeniolata White with subsp. *crebrestriata Tesch. 
Ses. (Ses.) tetragona Fabricius. 
Ses. (Ses.) thelxinoë de Man. 
Ses. (Ses.) tiomanensis Rathbun. 
*Ses. (Ses.) trapezoidea Guérin. 
Ses. (Parases.) vestita Stimpson. 
Ses. (Ses.) vicentensis Rathbun. 
*Ses. (Hol.) villosa A. Milne-Edwards. 
Ses. (Ses.) weberi de Man. 
* Metases. aubryi A. Milne-Edwards. 
* Metases. rousseauxi H. Milne-Edwards. 
Metases. trapezium (Dana). 
Sarm. birdt Nobili. 
*Sarm. crassum Dana. 
*Sarm. fryatti Tesch. 
Sarm. indicum (A. Milne-Edwards) with subsp. malabaricum Henderson. 
Sarm. inerme de Man. 
Sarm. integrum (A. Milne-Edwards). 
*Sarm. punctatum (A. Milne-Edwards). 
Clistoc. balansae A. Milne-Edwards. 
*Clistoc. merguiense de Man. 
*Clistoc. tectum (Rathbun). 
Of the 123 species of Sesarma no less than 93, more than 75°/,, are 
living in the Indo-Pacific region. Some of these species have an extre- 
mely wide range, occurring from East Africa and Madagascar to New 
Caledonia and the Fiji Islands; others are very local. The Red Sea, that 
has no fresh water at all at its coasts, possesses only a single species 
(Ses. jousseaumei) and this has not been found elsewhere. 
The only subregion seems to be Japan; at least I am inclined to 
believe, that nearly all the species of Sesarma recorded from Japanese 
and neighbouring seas, down to Cochinchina and the Gulf of Siam, do 
not occur elsewhere. These species are: Ses. bidens, dehaani, haematocheir, 
intermedia, neglecta, picta, plicata, rupicola, sinensis and vestita. Some of 
these (bidens, picta) are recorded from some localities in the Indian Ocean 
or the Malay Archipelago, but in the case of Ses. bidens all specimens 
from other localities than Japan are perhaps to be referred to the sub- 
16 
(20—VII—1917) 
