’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 233 
Ses. (Chirom.) africana H. Milne-Edwards. 
*Ses. (Hol.) angustipes Dana. 
* Ses. (Hol.) benedicti Rathbun. 
Ses. (Ses.) bidentata Benedict. 
Ses. (Hol.) cinerea (Bosc). 
Ses. (Ses.) crassipes Cado. 
*Scs. (Ses.) cwragaoensis de Man. 
Ses. (Hol.) hanseni Rathbun. 
Ses. (Ses.) jarvisi Rathbun. 
Ses. (Hol.) miersii Rathbun. 
*Ses. (Hol.) recta Randall. 
Ses. (Ses.) reticulata Say. 
*Ses. (Hol.) ricordi H. Milne-Edwards and subsp. terrestris Verrill. 
*Ses. (Hol.) robert H. Milne-Edwards. 
Ses. (Hol.) rubripes Rathbun. 
Ses. (Hol.) tampicensis Rathbun. 
Ses. (Ses.) verleyi Rathbun. 
Sarm. pectinatum H. Milne-Edwards. 
Thus there are 17 species of Sesarma (10 of ‘Holometopus, 6 of Sesarma 
s.s. and 1 of Chiromantes). So, along both coasts of the Atlantic, Holo- 
metopus furnishes most of the Sesarma-species, unlike the ratio of numbers 
in the Indo-Pacific region. The majority of species has been found in 
the West Indies, and two species from these islands are also found at 
the opposite coast of West Africa (Ses. africana and Ses. roberti, see 
preceding page). One species (Ses. reticulata) extends far to the north, 
even to New Haven, where, according to S. J. Smith, it inhabits salt 
marshes. On the Bermudas two species are found: Ses. cinerea and Ses. 
ricordi, the latter with the subspecies terrestris. The Leiden Museum 
contains 6 of the 17 Sesarma-species here enumerated. 
Miss Rathbun (Proc. Biol. Soc. Washington, v. 11, 1897, p. 97) has 
given a very useful, though rather concise, key to all the American 
species of Sesarma. Since then, however, several new species have been 
made known (Ses. jarvisi, tampicensis and verleyi by the same author, 
and the subsp. terrestris of Ses. ricordi by Verrill). 
The West American region contains only the following species: 
Ses. (Ses.) aequatorialis Ortmann. 
Ses. (Hol.) angusta Smith. 
Ses. (Ses.) barbimana Cano. 
Ses. (Hol.) biolleyi Rathbun. 
