Report on the zoological collections made in the Indo-Pacific Ocean ...

566 COLLECTIONS FEOM THE WESTERN INDIAN OCEAN.2. Gonodactylus graphurus, Iliers.A scries of specimens was obtained at the Seyclielles (No. 194)with the preceding species.Both G. chiragra and G. grajplmrus are referred to at p. 298 ofthis <strong>Report</strong>.3. Gonodactylus elegans. (Plate Lll. fig. B.)The body is smooth, not longitudinally costated ; carapace nearlyoblong, without spines at the autero-lateral angles. Rostral platosmooth and somewhat transverse, with its anterior margin regularlyarcuated, and the posterior margin straight, its distal extremity notacute. Antepenultimate and penultimate thoracic segments roundedon the sides, and the former but little laterally produced ; the lastthoracic segment is overlapped on the sides by the produced androunded autero-lateral lobes of the first postabdominal segment.The postero-lateral angles of the fourth to sixth postabdominal segmentsare acute ; the third to fifth segments have each on the dorsalsurface five small pits; the sixth segment has its posterior marginarmed with four small spines (including the produced and spiniformpostero-lateral angles); the terminal segment is about as long asbroad, dorsally nearly smooth, with an acute longitudinal mediancarina, which terminates posteriorly, behind the distal margin, in asmall spinule ; the posterior margin is armed with six strong spines,of which the submedian pair are tipped with a small mobile spinule,and have between them about twenty-six minute sjiinules ; betweenthe submedian aud the next large spines are two smaller teeth, andbetween the second and third larger spines one smaller tooth. Theeye-peduncles are robust, and about reach to the distal end of thepenultimate joint of the antennules, one of whose three flagella ismuch shorter than the others. The antenna) are about as long asthe antennules ; the antepenultimate peduncular joint is armed witha short spinule ; the basal scale is very much narrowed at base, androunded and ciliated at its distal extremity. The raptorial limbshave the merus-joints thickened through about two thirds of theirlength, and thence narrowing distally ; carpus and penultimatejoint slender and unarmed ; dactylus slender and but little ventricoseat base, armed on the proximal half of its inner margin with twoteeth, and with the distal extremity slender and acute. The appendageto the antepenultimate joint of the three posterior thoraciclimbs is styliform, slender, and very nearly as long as the penultimatejoint. The postabdominal uropoda are about as long as theterminal segment, their basal processes terminate in two strong andnearly equal spines, and there is a small spine above the outerramus, which latter is a little longer than the inner ramus, biarticulate,the basal joint armed on its outer margin with a series ofstrong spinules ; the inner ramus is ovate, ciliated, and unarmed.Length of the largest specimen about 11 lines (23 millim.).