’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 139 
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 Pade). 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 Qj’). 
1 2 5) 
Distance between external orbital angles . . . 24.— 25.75 26.— mm. 
Greatest breadth of carapace (at the base of second 
pair of walking legs) . . . 2 os, 240 28.— 27.— , 
Length of carapace in the median tine: Ho 210.0 0242920200 
en Lau UNS dd 145: 1475, : 
mMenzentarideneth of chela . : . . 1.21: 25.5 24.5 9, 
Senet nent of palm... . 44. . 105, 13.5 12.5 >, 
ae i of penultimate pair of legs a an en : 
Posterior margin of penultimate segment of ab- _ 
donrenk: 205°. rbi LOD 02de, 
Length of EN tate segment De aon POA DAD, 
N°. 1 is the old specimen from Borneo, n°. 2 that from Balikpapan, 
n°. 3 that from Deli (Zool. Mus. Amsterdam). 
20. Sesarma (Sesarma s.s.) brockii de Man. 
1887. Sesarma brockii de Man. Zool. Jahrb. Syst. Bd. 2 p. 651 — 
Amboina. 
1888. Sesarma brockit de Man. Arch. Naturgesch., Jahrg. 58. 1. p. 373, 
pl. 16 f. 3 — Amboina. 
1891. Sesarma brockii Thallwitz. Abhandl. Mus. Dresden, Bd. 3 1890/91 
p. 39 — Ternate. 
1894. Sesarma brockii Ortmann. Zool. Jahrb. Syst., Bd. 7 p 721 — Pacific. 
1895. Sesarma (Episesarma) brockit de Man. Zool. Jahrb. Syst., Bd. 9 
p. 171 — Pontianak. 
1899. Sesarma (Sesarma) brockii Nobili. Ann. mus. civ. stor. nat. Genova, 
| (2) t. 20 p. 507 —- locality? 
1900. Sesarma brockii Alcock. Journ. As. Soc. Bengal, v. 69 prt. 2 
p. 421 — Andamans. 
1901. Sesarma (Episesarma) brockii Nobili. Boll. Mus. Torino, t. 16 n°. 
397 p. 3 — Sarawak (Borneo). 
