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

CRUSTACEA. 293above the scale of the external antennae, which is armed with aspinule at its autero-external angle. This I propose to designateH, spinuliferus.13. Anchistia petitthouarsi, Audouin ?The carapace, with its rostrum, is shaped nearly as in Palcnmon ;the terminal postabdominal segment is narrow, with four spines onits upper surface, placed close to the lateral margins, and terminatesin two long mobile spines and three smaller spines. There is asupraorbital spinule situated on each side of the rostrum, betweenit and the eyes and just behind the anterior margin of the carapace,also an antennal spine outside of the eyes, and one (the branchiostegal?) placed below the eyes and behind the anterior margin.The rostrum is longer than the peduncles of the antcnna3, nearlystraight, has six teeth on its upper and four on its lower margin,and is bidentate at apex ; the last tooth of the series is situated inthe median dorsal line of the carapace behind the auterior margin.The eyes are, as in Leander, of moderate size and project laterally.The antennules have the antepenultimate (?) joint of the pedunclesdilated, laminate, and vertically compressed, with a small spinuleat its antero-external angle ; the two following joints are short andslender and terminate in two flagella, of which the thicker is shortlybifid at its apex, the other is broken. The antennal scale is muchelongated, narrow, nearly reaching to the apex of the thicker antennularyflagellum, and completely concealing (in a dorsal view)the peduncles of the antennae ; it is ciliated on its inner margin andat its apex, and has a spinule at its antero-internal angle ; the antennalflagellum is about as long as the animal. Tlie outer maxillipcdesare subpediform, with the antepenultimate but little thickerthan the last two joints, the penultimate longer than the last joint.The anterior legs (or chelipedes) arc very slender, with the wrist aslong as the palm and fingers together ; the second legs are slender,but thicker than the preceding ; morus-joiut with a small spine atthe distal end of its inferior margin ; the wrist, which is littlelonger than the palm, is also armed with a spine at its distal extremity; the palm is very slender, nearly terete, and about as longas the fingers ; these latter are without teeth on the inner margins,and have the tips slightly incurved. The ambulatory legs areslender and clothed with a few distant hairs ; the penultimatejoints very long; the dactyli slender, styliform, nearly straight, andnot half a's long as the preceding joints. The bases of the ui^opodahave a small spinule at the distal end of the outer margin, and thereare two subterminal spinules on the outer margin of each outerramus ; the rami are subovate (as usual) and ciliated at the distalextremity and along the inner margins ; the outer somewhat broaderthan the" inner ramus. Colour (in spiritj whitish. Length nearly10 lines (21 milbm.).The unique specimen (a female with ova) was obtained at PortMollo ou the beach (No. 98).