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

;294 COLLECTIONS FROM MELANESIA.I regard the Ancliistia c/randis of Stimpson, from Ousima*, assynonymous with Anchistia petitthouarsi.The differences in the proportions of the second legs in our specimenand that described by Mr. Stimpson may perhaps be due toBex. Stimpson does not mention the number of the teeth (if any)on the inferior margin of the rostrum in his example ; but as hesays " A. ensifronti affinis," it may be presumed that, as in Dana'sspecies, there are three teeth on the inferior margin of the rostrum,and also that there is, as in that species, a supraocular spine.Anchistia inci'quimana of Heller is, according to Ivossmannf, also%yao^lyTSlo\^?.^\ih.A.'p€tittllOuars^.It is remarkable that neither inthe figure of Savigny, nor in Heller's long description of A. incpquimanain the ' BeitrJige zur Crustaceen-Fauna des rothen Meeres,'can I find any indication of the supraocular spine ; so that our specimenmay after all belong to a distinct species.14. Coralliocaris ? tridentata. (Plate XXXII. fig. C.)The body is rounded above and not compressed ; the anteriormargin of the carapace bears a strong spine outside of the eyepedunclesand above the basal anteunal scale. The rostrum is short,not reaching to the end of the peduncles, and has three spiniformteeth on its upper margin ; its lower margin is entire ; the apex curvesgently upward and is acute. The segments of the postabdomenare without spinules ; the terminal segment has four small mobilespinules on its upper surface near the lateral margins, and thesomewhat rounded apex is tipped with a few short setfe. The eyesare rather short, robust, and reach about halfway to the apex ofthe rostrum. The antepenultimate joint of the peduncles of theantennules is about as long as the two following taken togetherthese are short and of equal length ; the longer flagellum is broken.in the single specimen examined, the shorter is slightly bipartite atits distal end. The basal antennal scales are shorter than thepeduncles of the antennules, rounded and ciliated at the distal ends,and with a very small spinule on the outer margin. The antepenultimatejoint of the outer maxillipedes is very little longer andbroader than the penultimate joint, which about equals the terminaljoint in length. The anterior legs (the left only is perfect) are veryslender ; the wrist much exceeds the hand in length, the slender'palm about equals the fingers. Of the second legs also only theleft is perfect ; this limb has the joints smooth and unarmed, themerus longer than the carpus, which is less than half the length ofthe palm, which is much shrivelled, but its lower margin appears tohave been carinated ; the fingers are less than half the length ofthe palm, acute at their apices, and without teeth on their innermargins. The third legs are robust, with the merus and penultimatejoints compressed ; the dactyl minute, curved, and with aminute tooth on the lower margin. The following legs are imperfect.* Proc. Acad. Nat. Sci. Philad. p. 39 (]8(>0).t Zool. Ergebn. Reis. roth. Meer. ii. p. 83 (1880).