's RISES MUSEUM VAN NATUURLIKE HISTORIE - — _ LEIDEN. — eel? 

difference is merely individual or indicates a real variety; if the two 
forms did not occur both in Borneo or its immediate neighbourhood, we 
should be inclined to accept the latter supposition, which now, however, 
seems uncertain. 
Besides on the east coast of the Asiatic continent this species has been 
also found at Borneo, and Nobili has been the first to record it from 
Sumatra (Siboga and Padang). I do not know of any record from Java 
or the Moluccas, nor from New Guinea or Australia. 
Dimensions of the three’ specimens examined (all <’). 
1 2 3 
Distance between external orbital angles . . . 24.— 25.75 26.— mm. 
Greatest breadth of carapace (at the base of second 
pair of walking legs) . . . J fis cow 2450) 20s" 2 
” 
Length of carapace in the medias nee eg eseelD a4. 20 Ro. oe 
neadihoig EeOMbag. oh aed aiieae stl ee eal TA AC Ape 
Flonizontal lengthof clielay sa 8.) es PIT 25.5" 24.5. ee 
Gremtesc@neic hits of palm Wr amsts) Mpa a LODE TSO: wl 2:oeee 
me, oes of penultimate pair of legs ae ae ae : 
Posterior margin of penultimate segment of ab- 
donien 9 fa. heres” s )e Otel). Die gio. nner 
Length of cenalinmete Sesion of abdomen mh. eh eo D, SAC 
N°, 1 is the old specimen from Borneo, n 
0 
2 that from Balikpapan, 
n°. 3 that from Deli (Zool. Mus. Amsterdam). 
1887. 
1888. 
1891. 
1894, 
1895. 
1899. 
1900. 
1901. 
20. Sesarma (Sesarma s.s.) brockii de Man. 
Sesarma brocku de Man. Zool. Jahrb. Syst., Bd. 2 p. 651 — 
Amboina. 
Sesarma brockii de Man. Arch. Naturgesch., Jahrg. 53. 1. p. 373, 
pl. 16 f. 3 — Amboina. 
Sesarma brockwu Thallwitz. Abhandl. Mus. Dresden, Bd. 3 1890/91 
p. 39 — Ternate. 
Sesarma brockvi Ortmann. Zool. Jahrb. Syst., Bd. 7 p.721 — Pacific. 
Sesarma (Episesarma) brockii de Man. Zool. Jahrb. Syst., Bd. 9 
p- 171 — Pontianak. 
Sesarma (Sesarma) brockti Nobili. Ann. mus. civ. stor. nat. Genoya, 
(2) t. 20 p. 507 — locality? 
Sesarma brockii Alcock. Journ. As. Soe. Bengal, v. 69 prt. 2 
p- 421 — Andamans. 
esarma (EKpisesarma) brockii Nobili. Boll. Mus. Torino, t. 16 n°. 
397 p. 3 — Sarawak (Borneo). 
