212 
THE VOYAGE OF H.M.S. CHALLENGER. 
truncated or narrowed and rounded, and bear tlie next joint at their antero-internal 
angles. The chelipedes (in the adult) are of moderate length, usually somewhat unequal, 
with the merus trigonous ; carpus armed with a strong spine on its inner margin ; palm 
short, compressed ; dactyli dis tally acute and dentated on the inner margins. The 
ambulatory legs are rather slender and of moderate length, with the joints smooth ; 
dactyli in all slender, styliform. 
One species of this genus, Gomezct bicornis, is rather common in the Indo-Malaysian, 
Japanese, and Australian Seas, another, Gomezci serrata , Dana, occurs on the coasts of 
Chiloe, Patagonia, and in the Straits of Magellan, in shallow water (to 30 fathoms). 
Gomeza bicornis, Gray. 
Gomeza bicornis, Gray, Zool. Miscell., p. 39, 1831; Crust, in Griffith, Animal Kingdom of 
Cuvier, vol. xiii. p. 296, pi. xxiv. fig. 1, 1833 ; List Crust. Brit. Mus., p. 52, 1847. 
Corystes ( CEidea ) viginti-spinosa, de Haan, Crust, in v. Siebold, Fauna Japonica, p. 44, pi. ii. 
fig. 5, 1835. 
Gomeza viginti spinosa, A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. x. p. 52, pi. iii. 
fig. 5, 1874. 
Celebes Sea, 10 fathoms (Station 212), lat. 6° 54' 0" N., long. 122° 18' 0" E. A 
small female. 
? . Lines. Millims. 
Length of carapace, about . . . . . . 7| 15 
Breadth of carapace, . . . . . . .5 10’5 
Legion IY. THELPHUSINEA. 
Thelpheusiens, Milne Edwards, Hist. Nat. Crust., vol. ii. p. 7, 1837. 
Thelphusinee, Milne Edwards, Ann. d. Sci. Nat., Zool. xx. p. 207, 1853. 
Tlielpliusinea or Cancroidea Grapsidica, Dana, U.S. Explor. Exped., vol. xiii., Crust. 1, pp. 
145, 292, 1852. 
This section of the Cyclometopa includes in Dana’s system those terrestrial or fiuviatile 
crabs which are intermediate in structure between the typical Cancroidea (Cancridae) 
and certain Catometopa (Gecarcinidse). They resemble these latter in their terrestrial 
habits, and approach them in many particulars of structure, e.g., in the form of the 
carapace, which is more or less dilated at the branchial regions, and in the usually spinu- 
liferous dactyli of the ambulatory legs, but as in other Cancroidea the male verges pass 
directly through the basal joint of the fifth ambulatory legs and not through sternal 
ducts, and the carpal joint of the endognath of the exterior maxillipedes is articulated 
with the merus at or near its antero-internal angle or at the apex, not at the antero- 
external angle. 
This group includes the single family Thelphusidse. 
