44 
THE YOYAGE OF H.M.S. CHALLENGED. 
In the numerous genera of this group the carapace is usually subtriangulate ; the 
rostrum emarginate or two-spined ; the orbits well defined and yet incomplete ; eyes 
completely retractile ; chelipedes with fingers acute, and ambulatory legs of moderate 
length. 
Egeria, Leach. 
Egeria, Leach, Zool. Miscell., vol. ii. p. 39, 1815. 
„ Milne Edwards, Hist. Nat. Crust., vol. i. p. 290, 1834. 
„ Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 654, 1879. 
The carapace is subpyriform and nearly as broad as long, moderately convex and 
tuberculated ; rostrum prominent, vertically compressed, and more or less deeply emar- 
ginate at the distal extremity. Orbits shallow and very open above, and with two wide 
fissures in the superior and two in the inferior margin. Epistoma transverse. Post- 
abdomen in the male seven-jointed, in the female five-jointed (the fourth to sixth 
segments coalescent). Eyes short, retractile. Merus of the exterior maxillipedes trun- 
cated at the distal extremity, the antero-external angle not produced, the antero-internal 
angle (where the next joint is articulated) slightly notched. Chelipedes (in the adult 
male) moderately elongated ; palm about as long as the merus, and but slightly com- 
pressed ; fingers acute, and having between them, when closed, but a small interspace at 
the base. Ambulatory legs slender, subcylindrical and extremely elongated, but diminish- 
ing successively in length. 
Several species of the genus have been described, all of which are, however, probably 
to be regarded as synonymous with or varieties of Egeria arachnoides (Rumph), which 
occurs commonly in the Australian, Indian, Malaysian and Chinese Seas, in water of 
moderate depth (to 49 fathoms). 
Egeria arachnoides (Rumph). 
Cancer arachnoides, Rumph, DAmboinische Rariteit-Kamer, pi. viii. fig. 4, 1741. 
'll Cancer longipes, Linne, Mus. Ludovici Ulrici, p. 446, 1764; Syst. Naturae, ed. 12, p. 1047, 
• 1766. 
Egeria arachnoides, Milne Edwards, Hist. Nat. Crust., vol. i. p. 291, 1834. 
,, „ Miers, Crust, in Report on Zool. Coll. H.M.S. “Alert,” p. 191, 1884. 
Egeria herbstii, Milne Edwards, tom. cit., p. 292, 1834. 
Egeria vndica, Leach, Zool. Miscell., vol. ii., pi. lxxiii., 1815. 
„ ,, Milne Edwards, tom. cit., p. 292, 1834. 
Leptopus longipes, Latreille, Milne Edwards, Atlas in Cuvier, Regne Animal, Crust., ed. 3, 
pi. xxxiv. fig. 1. 
Specimens were dredged at the following localities — 
Station 188, South of New Guinea, in 28 fathoms ; lat. 9° 59' 0" S.,long. 139° 42' 0" E. 
(young female). Station 190, Arafura Sea, in 49 fathoms; lat. 8° 56' 0" S., long. 
