Rev. A. M. Norman on a neiv Genus of British Hijdrozoa, 261 Aristotle, partly because to have done so would have been to anticipate the results of a wider inquiry. Probably many other members of this class were known to Aristotle than those he has named ; probabl)^, also, these unknown animals have, by taking a share (whose limits it is useless to attempt to define) in the descriptions we have been studying, helped to increase the con-fusion and uncertainty. The following table contains the systematic classification of the Malacostraca mentioned by Aristotle, and their probable equivalents. The classification is that of Heller, op. cit. Crustacea Podophthalmia. Brachyura Portunus dqmraior, Linn. 1 Cancer pagurus, Lmn. Thelphusa Jiuviatilis, Latr. Pinnotheres veterum. IMaia Squinado. ? Ocypoda cursor. Eupagurus Bernhardus, Brandt. Diogenes varians,Costa. IScyllarus. Palinurus vulgaris. Anonmra. Macriira. Fam. Pterygura. Fara. Loricata. ?Fam. Thalassinidse. Fam. Astacidse. Homarus vulgaris. = 0L KapKlVOl 01 fXlKpOL (De Part. iv. 8). = IIdyovpoL. =:0l KapKlUOL 01 TTOTO.-pioi. = ni.vvo(pvKa^. =/u.ata. = 'HpaK\€COTlKoi. ='lnn€vs. = t6 KapKlVlOV TO TWV orrpofjL^Qiv. =r6 Tti>v vqpLTojv. = Kdpa^os. ]-aaraKos. INephrops norvegicus. Astacus, flu viatile form, —oi do-raKol oi irord-Fara. Caridae. Crangon vulgaris. IPalcBmon squilla "^PencBus caramote IStenopus spinosus ? An omobrancliiata. Fam. Squillidaj Squilla mantis. }'â– pLlOl. â– T] Kap\s rj KViprj. r) KapXs rj KV(f)T}. â– â– TO Kapidiov. :rj Kpdyycav, Incertae sedis {â– = 0L apKTOl. = 6 KvXKapos» XXVIII. — On Merona, an undescribed Genus of British Hydrozoa. By the Rev. Alfred Merle Norman, M.A. Class HYDROZOA. Fam. Clavidse (Allman). Genus Merona*, nov. gen. Trophosome. — Coenosarc consisting of erect or semierect simple tubes, which arise at intervals from a creeping, filiform * Nomen arbitrarium proprie assignatum.
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