588 
THE VOYAGE OF H.M.S. CHALLENGER. 
163a, off Twofold Bay, in 150 fathoms, where two or three species were dredged; 
among them a new species of the Cancroid genus Medceus ( Medceus haswelli ) allied 
to Medceus elegans, A. M.-E., from New Caledonia, but distinguished by the different 
areolation of the carapace, and the absence of the numerous small spines and tubercles 
which in Medceus elegans exist between the antero-lateral marginal teeth of the 
carapace. 
“At Tongatabu (Station 172), in 18 to 240 fathoms, several new and interesting forms 
were collected, notably in 240 fathoms a new species ( Randcdlia granulata ) of the rare 
Leucosoid genus Randcdlia, Stimpson, distinguished from the Californian Randcdlia 
ornata by the coarsely and evenly granulated carapace, the less prominent front, and 
slenderer chelipecles. This species occurred also at the Fijis (Station 173) in 315 fathoms, 
together with Pseudorhombila ( Pilumnoplax ) abyssicola, n. sp., a species with nearly 
glabrous carapace, straight entire front, and three antero-lateral marginal teeth, of which 
the two last only are spiniform and acute, and a new species of Mursia ( Mursia 
curtispina )allied to Mursia armata, de Haan. 
“ The Crustacea of the northern and northeastern coasts of Australia are as a rule 
very distinct from those of the eastern and southern shores ; but few species collected 
by the Challenger in the Torres Strait and Arafura Sea are new to science. At the 
Ki (Ke) Islands, however, in 140 fathoms, occurred some of the most interesting and 
remarkable forms in the collection. There are specimens of a large and beautiful Maioicl 
Crustacean which I have designated Cyrtomaia murrayi, a new genus and species (see 
fig. 196), apparently allied to Euprognathci, Stimpson, but distinguished by the remarkable 
convexity of the carapace, which is almost vertically cleflexed at the gastric region, by 
the great development of the gastric spines, and by the elongated and spinuliferous 
chelipedes; also Oxypleurodon stimpsoni, a new genus and species allied to Leucippe , 
Epialtus, and Eupleurodon, and characterized by the subpyrifonn deeply channelled 
carapace, the slender divergent rostral spines, the distinct prseocular and branchial spines, 
and the non- dentigerous ambulatory legs ; and apparently new species of Pugettia , 
Hyastenus, Pilumnus, Lupocyclus, and Platyonychus (Platyonychus iridescens). The 
last-named is a very fine species, and is distinguished by the strongly granulated and 
spiniferous palm and dactyl of the chelipedes, and by the iridescent reflections of 
the carapace. 
“ At Banda and Ternate the few crabs taken were common species. At Amboina new 
species of Naxia and Gonoplax were dredged in 100 and in 15 to 25 fathoms; the 
latter ( Gonoplax sinuatifrons) very nearly allied to the common European Gonoplax, 
rhomboides, and distinguished only by the sinuated .frontal margin and shorter cheli- 
pedes. In the Molucca Passage Oncinopus arcinea, de Haan, was dredged at Station 
196 in 825 fathoms; this, with two exceptions, referred to above, is the greatest depth 
at which any Brachyurous Crab was taken by the Expedition. 
