118 
the Voyage of h.m.s. challenger. 
larger chelipede is much more distinctly granulated on and near the upper margin and at 
the base than elsewhere ; the fingers are regularly denticulated on the inner margins and 
acute at the tips, and the dactylus sulcated above. The smaller chelipede is externally more 
strongly granulated, with relatively longer and more slender fingers ; the ambulatory legs 
(of the second pair) are slender, with the merus, carpus, and penultimate joints 
denticulated on their upper margins, and the dactyli styliform, straight. Colour (in spirit) 
yellowish-brown ; the fingers of the chelipedes are chocolate-brown, the coloration not 
extending over the palmar surface. 
Adult $ . 
Lines. 
Millims. 
Length of carapace, about .... 
3 
6 
Breadth of carapace, about .... 
4 
8-5 
Length of larger chelipede, nearly 
5 
10 
Two males and a female were trawled off Twofold Bay in 150 fathoms (Station 163a). 
All are very small in size, yet the male, from which the description is mainly taken, is 
apparently adult. The ambulatory legs are deficient, except in one specimen, where only 
one leg is perfect. 
The characteristic disposition of the sulci of the carapace may be better understood 
by a reference to the figure than by any detailed description. 
The nearest ally of this species is perhaps Medseus elegans, A. Milne Edwards, from 
New Caledonia, 1 in which, to judge from the figure, the areolation of the carapace is 
different and the antero-lateral margins of the carapace longer ; in Medseus granulatus 
the small intermediary spines and tubercles of the antero-lateral margins, characteristic 
of Medseus elegans, do not exist. The granulated (not cristiform or nodose) palms of 
the chelipedes further distinguish Medseus granulatus from all the species known to me. 2 
Actsea, de Haan. 
Adeea, de Haan, Crust, in Siebold, Fauna Japonica, dec. i. p. 18, 1833. 
„ Dana, U.S. Explor. Exped., vol. xiii., Crust. 1, p. 148, 1852. 
,, A. Milne Edwards (pt.), Nouv. Archiv. Mus. Hist. Nat., vol. i. p! 259, 1865. 
Euxantlwdes , Paulson, 1875 ,fide Kossmann. 
Psaumis, Kossmann, Crust, in Zool. Ergeb. einer Reise Kiistengeb. d. rothen Meeres, 
Malacostraca, p. 26, 1877. 3 
The carapace is transverse and moderately convex and is usually very distinctly 
lobulated on the dorsal surface ; the lobules usually granulated, with the intervening 
1 Nouv. Arcliiv. Mus. Hist. Nat., vol. ix. p. 211, pi. viii. fig. 1, 1873. 
2 This species also bears some external resemblance to the Australian form I have recently described as Galene 
granulata, hut in Galene granulata, as in the typical Galene bispinosus (Herbst), the basal antennal joint does not reach 
the subfrontal process. Neither in the species of Galene nor in Medxus haswelli are ridges developed on the endostome 
or palate. 
3 The genus Banarcia, A. Milne Edwards, may perhaps not be distinct from Adeea; I have, however, referred a 
species to this genus in the Report on the Crustacea of H.M.S. “ Alert,” p. 210, pi. xix. fig. c, 1884, vide A. Milne 
Edwards, Ann. Soc. Entom. France, ser. 4, vol. ix. p. 167, 1869. 
