40 
though he subsequently added to the synonymy the “ calling 
crabs” of Herbst and Bosc. Latreille at the first institution 
of Gelasimus attributed the genus to Buffon, though in 1820 he 
claims it as hisown. He gave no reference for the name to 
any part of Buffon’s works, and no such reference has since 
been discovered. 
Uca arcuata (de Haan). 
1835. Ocypode(Gelasimus) arcuata,de Haan, Crustacea Japonica, 
decas secunda, DP: 26:53, )F1t 7, ieee: 
1837. Gelasimus arcuatus (?), Milne-Edwards, Hist. Nat. Crust., 
Vol. II, page 52. 
1843. Gelasimus arcuatus, Krauss, Sudafrik. Crustaceen, pp. 
14, 39. 
1882. Gelasimus arcuatus, Haswell, Catal. Australian Crust., 
p. 92. 
1894. Gelasimus arcuatus, Ortmann, Zool. Jahrb., Vol. VIL., 
Pp. 755- 
Further references to H. and A. Milne-Edwards, Miers, 
Kingsley, and de Man, will be found in Haswell’s and Ortmann’s 
works above cited. H. Milne-Edwards in 1837 observes that 
de Haan’s figure much resembled G. platydactylus, but that the 
description of de Haan’s species was still unpublished. That, 
however, was a mistake, 1f we may trust the date ‘ Decas 
Secunda, 1835 ” printed at the foot of p. 25 in de Haan’s work, 
of which the Decas Tertia is in like manner dated 1837, at p. 65. 
Ortmann expresses a doubt whether the specimens from non- 
Japanese localities assigned to this species by various authors 
really belong to it. Krauss speaks with tolerable confidence 
of the form to which he assigns the name, and which he found 
represented by swarms in the Bay of Natal. He says that 
the hands are bright red, the carapace and pleon grey-blue, 
agreeing pretty well with the mud in which they burrow. He 
states that the breadth is fourteen lines and the length eight. 
De Haan’s measurement, ‘* Thorax latus et longus 10”’,”” must 
be due to a slip, since it is in no correspondence with his illus- 
tration. A dry specimen, male, from the Durban Museum, 
measures 25 mm.. between the extra-orbital points, with a 
length of 15°5mm., the little deflexed rostrum not included. 
Carapace, pleon, and ambulatory limbs are as figured by de 
Haan, but the eyes and chelipeds are missing, so that the 
identification is rather conjectural. 
