270 
THE VOYAGE OF H.M.S. CHALLENGER. 
sternum between the bases of tbe fifth ambulatory legs. Eye-pecluncles short, robust. 
Antennules transversely or almost transversely plicated. Antennae situated in the interior 
orbital hiatus ; the basal joint is very short and does not reach the front, and is slightly 
produced at its antero-lateral angle ; flagellum of moderate length. Exterior maxillipedes 
narrow, with a rhomboidal gape ; the merus of the enclognath is somewhat elongated and 
is rounded at the distal extremity, where the following joint is articulated ; exognath 
small and slender. Chelipedes (in the adult male) usually subequal and moderately 
developed ; merus trigonous ; carpus usually angulated, without a spine on the interior 
margin ; palm slightly compressed ; fingers distally subacute, or but slightly excavated. 
Ambulatory legs moderately elongated ; merus-joints compressed, and usually armed with 
a subdistal spine or tooth on their superior margins ; dactyli styliform, slightly 
compressed, and without spines. 
The described species are very numerous, and are of common occurrence on the shores 
and in the shallow waters of all the tropical and subtropical regions of the globe. They 
occur on the African coast southward at least to Natal, and • one species ( Sesarma 
pentagona, Hutton) has been described from New Zealand. 
The following are forms which are not referred to by Mr. Kingsley in his list of the 
species of this genus. Except Sesarma miniata, they are all too recently described to 
be inserted in it ; — 
Sesarma miniata, de Saussure. West Indies. 
Sesarma granosimana, Miers. Indo-Malaysian Seas. 
Sesarma biittikoferi, de Man. Liberia. 
Sesarma kamermani, de Man. Congo Coast. 1 
Sesarma miilleri, A. Milne Edwards (PL XXL fig. 3). 
Sesarma miilleri, A. Milne Edwards, Nouv. Archiv. Mas. Hist. Nat., vol. v., Bulletin, p. 29, 1869. 
„ „ Kingsley, tom. cit., p. 216, 1880. 
Bahia, shallow water (a small male). 
The identification is somewhat uncertain, since the diagnosis of the species is brief. 2 
S . Lines. Millims. 
Length of carapace, rather over . . . . . . 5 11 
Breadth of carapace, . . . . . . . 6-| 13'5 
1 I have proposed ( Proc . Zool. Soc.- Land., p. 70, 1881) Sesarma stimpsonii as an alternative name for specimens 
from Monte Video, doubtfully referred to Sesarma angustipes. 
2 This specimen differs from much larger examples in the collection of the British Museum, which have also been 
referred to Sesarma miilleri, in having the frontal margin perfectly straight without a median sinus, the sutures defining 
the postfrontal or epigastric lobes less deep and distinct, the sides of the carapace behind the exterior angle of the orbit 
more distinctly convergent ; the superior margin of the dactyl of the chelipedes is less distinctly granulated, but the 
palm is more distinctly granulated. The carapace in the largest specimen in the British Museum measures nearly 16 
lines (33 '5 mm.) in length, and about \1\ lines (37 mm.) in width. 
