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Show 1879.] MR. F. J. BELL ON THE ECHINOIDEA. 655 instead of with the red which is so conspicuous in P. parmatus. Our specimens are from New Ireland. PAPILIO BROWNI, n. sp. Exp. 4 in. P. wallacei similis, sed paulo obscurior, anticis maculis intra cellulam majoribus, ea ad basin viridissima, duabus interioribus linece submedianee angustioribus, maculis submarginalibus fere obsoletis; posticarum macula basali intra cellulam carente subtus anticis maculis virescentibus et colore purpurascente dimidio apicali absentibus; posticis maculis basalibus viridissimis, ea intra cellulam minutissima (fere obsoleta), lunulis rubris analem versus majoribus. W e have received a single female of this insect from New Ireland. The differences indicated in the foregoing description point out its specific distinctness from its close ally P. wallacei. Mr. Hewitson's figure of this latter species is taken from a New-Guinea specimen, and accurately agrees with an example sent us by Dr. Meyer, obtained by him in the same island (cf Kirsch, Mitth. d. k. zool. Mus. zu Dresden, Heft ii. p. 113). 8. Observations on the Characters of the Echinoidea-II. O n the Species of the genus Tripneustes, Agassiz. By F. J E F F R E Y B E L L , B.A. Magdalen College, Oxford, Zoological Department, British M u s e u m , F.Z.S. [Received June 16, 1878.] (Plate XLIX.) It is with the greatest regret that I, in laying before the Society a few observations on another genus of the Echinoidea, find myself compelled at the outset to offer some remarks on the nomenclature adopted by Prof. Alex. Agassiz. No one who is engaged in the study of these complex and difficult forms can do otherwise than feel that he owes a great deal to the acuteness of the talented American naturalist; and his work will perhaps gain in value when it has been more subjected to working criticism than it has hitherto been. As to the name which should be applied to the genus, Prof. Agassiz prefers to use the name Hipponoe (Gray) in place of Tripneustes (Agassiz) ; and he gives for tbis course reasons which I think deserve to be reprinted : - " In retaining the name Hipponoe of Gray, to which objections will undoubtedly be raised on the ground of Hipponoa having been before used by Audouin *, and from the fact of the name alone appearing without further indications of its connexion, I am simply carrying out the principle that Hipponoe and Hipponoa 1 Audouin & Milne-Edwards, Ann. Sc. Nat. xx. (1830) p. 156. |