42 
1837. Varuna litterata, Milne-Edwards, Hist. Nat. Crust., Vol. 
Il. D--05; 2. eis tie se 
1852. Trichopus litteratus, Dana, U.S. Expl. Exp., Vol. XIIL., 
p. 330, Pl. 20, fie.{8 a-p. 
1900. Varuna litterata, Alcock, Journ. Asiat. Soc. Bengal, 
Vol. -LXKIX., Pf. 2, peor 
A great number of additional references will be found -in 
Alcock’s work above cited. 
A dry specimen, of the female sex, from the Durban Museum, 
was devoid of chelipeds, but showed the characteristic H on the 
carapace, to which the specific name is due, and the setose 
armature of the ambulatory-natatory legs, to which de Haan 
alluded in the generic name Tvichopus. 
The carapace measured 23 mm. in breadth by 21°5 mm. in 
length. 
Gen. Planes, Leach. 
1825. Planes, Leach, in Bowdich’s Excursion to Madeira and 
Porto, Santo; p05. tip 2. 
1837. Nautilograpsus, Milne-Edwards, Hist. Nat. Crust., Vol. 
Th3p: 8o: 
1875. Planes, G. B. Sowerby, in Leach’s Malac. Podophth. 
Britanniae, Explan. of Pl. 27. 
1886. Nautilograpsus, Miers, Challenger Brachyura, Reports, 
Vol XV. Up 253! 
1893, Planes, Stebbing, History of Crustacea, p. 95. 
1900. Planes, Alcock, Journ. Asiat. Soc. Bengal, Vol. PGi: 
Pt. 25 ip. 290: 
The genus dates only from 1825, not from 1815, the year 
which Alcock assigns to Plate 27 in Leach’s Malacostraca 
Podophthalmata Britanniae. That work was continued and 
completed by George Brettingham Sowerby in 1875, Plate 27 
being one of the seven additional plates then added. Miers 
remarks that this genus “is allied in some particulars to 
Trapezia in the Cancroidea, and to Litocheira, Kinahan, in 
the Carcinoplacidae, from both of which it is distinguished by 
the broader basal antennal joint and the compressed and 
robust ambulatory legs.”” He observes that “‘ there is prob- 
ably but a single species of this genus (the common Gulf-Weed 
Crab), which occurs nearly everywhere on floating weed in 
the temperate and tropical seas of the globe, and has been 
referred to under many different specific names.” 
From the Grapsidae in restricted sense the genus is separated 
by having the front very shghtly and simply depressed. 
