

232 _ZOOLOGISCHE MEDEDEELINGEN " — - DEEL Ht 

species indica, and in the case of Ses. picta the records from the Indian 
Ocean and even of South Africa are not at all certain. Only Ses. plicata 
(= quadrata) is a very widely-spread species. The occurrence of Ses.. 
haematocheir at Singapore must be regarded either as quite exceptional 
or even accidental. 
Of the Indo-Pacific species of Sesarma 14 (6) belong to the subgenus 
Holometopus, 51 (24) to Sesarma s.s., 19(9) to Parasesarma and 9 (4) to 
Chiromantes. Of all the 93 species the Museum contains 43, and the 
numbers in brackets indicate how these are distributed over the four 
subgenera. At the close of this paper I have given a key to all the 
Indo-Pacific species of the genera here spoken of. 
The West African region contains the following species: 
*Ses. (Chirom.) africana H. Milne-Edwards. 
*Ses. (Hol.) angolensis Brito Capello '). 
*Ses. (Hol.) biittikofert de Man '). " 
* Ses. (Hol.) elegans Herklots. 
*Ses. (Chirom.) kamermant de Man. 
Ses. (Hol.) roberti H. Milne-Edwards. 
* Sarm. curvatum i. Milne-Edwards. 
These species have been enumerated already by Miss Rathbun (see 
note on this page). Of the 6 species of Sesarma 4 belong to Holometopus 
and 2 to Chiromantes, the subgenera Parasesarma and Sesarma s.s. being 
not at all represented; Parasesarma is wholly confined to the Indo- 
Pacific region. 
As in many other instances both coasts of the Atlantic have some 
forms in common, viz. Ses. africana and Ses. roberti; the first of these 
is at least recorded by Miss Rathbun from Barbados, and the second 
seems to have its principal habitat in the West Indies. These are the 
only instances of species of the genus Sesarma, occurring in two of the 
four areas of distribution. 
With the exception of Ses. roberti all the West African species are 
contained in the Leiden Museum; in 3 cases (Ses. biittikofert, elegans 
and kamermani) the type-specimens are even present; and the only 
species of Sarmatium is represented by the type-specimens of Ses. violacea 
Herklots. 
In the Kast American region the following species have been 
found : , 
1) This species has been erroneously referred by Miss Rathbun (Proc. U. S. Nat. Mus., y. 
22, 1900, p. 280) to Parasesarma. 
