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

)CRtrSTACEA, 553rather long whitish hairs, the chelipedes rather slender ; finger-tipswhite.By Kossmann (t. c. zweito Hiilfte, p. G7, 1880) D. unklcntata andD. rotunda are regarded as sj'iionyraons. The specimens collectedby Kossmann in the lied Sea are distinguished from D. spongiosavar. sthnpsonli b}' the prominent lateral teeth of the rostrum andthe existence of a distinct lateral marginal tooth behind the cervicalsuture.2. Dromia vulgaris, M.-Edw.Two very smaU specimens from Providence Island, 19 fms. (No.217), are perhaps referable to this species. They do not presentthe elongated tubercles on the sternal surface characteristic, as Hilgendorfhas shown, of D. rumj^hu*, to which species a specimenfrom the Mauritius (M. RohUlard), which I formerly designated asD. vulgaris, is to be referred, as the sternal tubercles are stronglydeveloped. A female, presumably from the Indian Ocean (GeneralHardwiclr), apparently belongs to B. vulgaris, since in this specimenthe sternal tubercles are absent ;yet it is to be noted that itpresents but slight indications of the secondary tubercle or spinebehind the base of the second antero-latcral marginal spine whichis generally characteristic of D. vulgaris. In the specimen fromMauritius also the secondary lateral spine is absent, but in anadult male Malayasian specimen from Dr. Bleeker's collection it isstrongly developed.HOMALODROMIA, gen. nov.Carapace flattened above, somewhat hexagonal in shape, almost asbroad as long. Front broad, consisting of two prominent lobes whichproject over and beyond the bases of the antennae, and are each excavatedat the distal extremity. Epistoma (or interantennulary septumtriangulate and united with the front. Palate with faintly definedlongitudinal ridges {collicuU). The sternal sidci in the female terminatein two strong tubercles, which are nearly in contact at theirbases, and are situated between the bases of the chelipedes, whichhave tlie apices of the fingers denticulated, corneous, and excavated.Ambulatory legs of the second and third pairs without spines ortubercles, with the merus-joint not dilated, the daetyli slightly curvedand armed on the inferior margin with two or three accessory spinules.Fourth legs more robust and much shorter than the fifthpair and scarcely prehensile, the penultimate joint being armed at itsdistal extremity with a very small spinule. Fifth legs slender andelongated (yet less elongated than in Pseadodrurnia), shorter thanthe second legs, prehensile, with the penultimate joint shorterthan the preceding, and its terminal spine slender, arcuate, andabout as long as the slender arcuate dactylus.This genus cannot be confounded with any known lo me. It* Monatsbc)-. Akad. \Vi:^s. Berlin, p. 813 (1878).