44 
cavern; the external maxillipeds leave a wide rhomboidal 
gap between them, an oblique hairy crest traverses them from 
a point near the antero-external angle of the ischium [third 
joint] to a point near the antero-internal angle of the merus 
{fourth joint]. Their palp articulates either at the summit 
or near the antero-external angle of the merus, and their 
exognath is slender and either partly or almost entirely con- 
cealed. The male abdomen either fills or does not quite fill 
all the space between the last pair of ambulatory legs. An- 
tennal flagella variable.” , 
Gen. Sesarma, Say. 
1817. Sesarma, Say, Journ. Acad. Nat. Sci. Philad., Vol. I., 
Ok 
1835. Pachysoma, de Haan, Crustacea Japonica, decas secunda, 
P- 33: 
1843. Sesarma, Krauss, Stidafrik. Crustaceen, p. 44. 
1886. Sesarma, Miers, Challenger Brachyura, Reports, Vol. 
XeVEL..., Ds 200. 
1888. Sesarma, de Man, Journ. Linn. Soc. London, Vol. XXII, 
p. 168. 
1897. Sesarma, M. J. Rathbun, Proc. Biol. Soc. Washington, 
Vol. XL. p.i8G: 
1g00. Sesarma, Alcock, Journ. Asiat. Soc. Bengal, Vol. LXIX.., 
Pt.2,.p:. 406: 
For this genus, which rests essentially on Cancer quadratus, 
Fabricius, 1798, a multitude of other references will be found 
in the authors above cited. 
Sesarma catenatum, Ortmann. 
1897. Sesarma catenata, Ortmann, Zool. Jahrb., Vol. X., p. 334, 
Pl. 17, fig. 9, 
Of the four sections into which de Man in 1888 divided this 
genus, the present species belongs to the second, defined as 
** Sesaymae without an epi-branchial tooth behind the external 
orbital angles, and in which the upper margin of the palm of 
the anterior legs of the male bears two or more oblique, parallel, 
minutely pectinated ridges.” Ortmann explains that it 
stands in relationship with S. quadratum (Fabricius), S. 
erythrodactylum, Hess, and S. melissa, de Man, “ especially 
the latter, but is at once distinguished by the hairy fingers 
of the chelae and the peculiarly interrupted, milled ridge on 
the movable finger.’’ Alcock in 1900 gives S. melissa as one 
of the synonyms of S. quadratum. 
