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

;526 COLLECTIONS FROM THE -WESTERN INDIAN OCEAN.posed of two moderately divergent spines. Orbits deep, tubular,with a lateral aspect, and with two nearlj* closed fissures above.Basal antennal joint very much dilated, with a small distal spine.Chelipcdes (in the male) rather small and slender, fingers nearlystraight. Ambulatory legs slender, not spinose or nodose.This genus must, I think, be associated with Pericera in thefamily Pcricerida;, on account of the deep, well-defined, and tubularorbits, notwithstanding the two narrow fissures in their superiormargin. It is further distinguished from Pericera by the deflexedrostrum and the absence of a series of lateral spines. In Priororhyncliusthe rostrum is deflexed, but lamellate and merely notchedat its distal extremity.13. Entomonyx spinosus. (Plate XLVII. fig. B.)The carapace is moderately convex, subpyriform ; its surface unevenand granulated, with two spines in a longitudinal series on thegastric, two in a transverse series on the cardiac, and two on thebranchial regions near the postero-lateral margins. The spines ofthe rostrum are rather short, moderately divergent, broadest at base,and distally acute. The orbits are deep, tubular, project somewhatlaterally, and are bordered with short spiniform teeth ; in the uppermargin, near the postocular lobe or tooth, are two narrow fissures.The postabdomen (in the male) is narrow, with the segments alldistinct, the first the shortest. The pterygostomian regions aregranulated. The basal antennal joint is granulated and very muchenlarged, and has a short spine at its distal extremity beneath thebase of the next joint, besides two small spines which are situatedon the inferior margin of the orbit. The anterior legs or chelipcdesare of moderate length and rather slender; merus-joint or armgranulated, and with a scries of spines on the upper and lower surfaces; the wrist and palm also very closely granulated, the wristwith some longer tubercles or short spines on its outer surface nearbase ; the palm rather slender, nearly twice as long as the wristthe fingers nearly straight, acute at their apices, and regularly denticulatedalong their inner margins. The ambulatory legs are veryslender, and decrease regularly in length from the first to the lasttheir merus-joints are minutely spinulose above, and have a longerspine at the distal extremity. The carapace and ambulatory legs areclothed with short curled hairs, which are longest and most denseat the base of the rostrum. Colour (in spirit) pinkish. Length ofcarapace to base of rostrum nearly 5^ lines (11 millim.), greatestbreadth Ah lines (9*5 millim.) ; length of a chelipede about | inch(13 millim?).An adult female and small male were collected at ProvidenceReef, 24 fms. (No. 215), and three males and a female at ProvidenceIsland, 19 fms. (No. 217).The rostrum is more strongly deflexed in the females than in themales.