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Show 136 MR. CYRIL CROSSLAND ON THE [June 16, intelligible descriptions have been published, may be useful to future workers:- A. Prostomium undivided. 1. Gills larue, confined to a few anterior segments*. 31. stragulum, 31. belli, 31. adenensis. 2. Gills of moderate size, extending over most of the body's length 3I.macintoshi,s]).no\. B. Prostomium bifid. a. Capillary seta-only present 31. mossambica. fi. Tentacles three times length of the prostomium. 1. Compound setae hooked M- goodsiri. 2. Compound seta? with knife-like articulated pieces 31. acicularum. y. Tentacles not twice length of prostomium. 1. Gills of one or two filaments 011I3': Compound setse of both kinds 3I.fallax. „ „ with hooked appendage ... M. saxicola. „ „ „ knife-like appendage only 31. striata. 2. Gill- of moderate size : , 3L corajuna. a. With hooked compound seta? 1 J J reQaiis. a ...... , , C M. simplex, sp. nov. 3. „ knife-like compound set;e | M.furcellata, sp. nov. Grube (" Mittheilungen iiber die Familie der Euniceen " Natur-wiss. Schles. Ges. 1877) gives numerous species of this genus from Schmarda, who, however, described them under the name Eunice, in the definition of which genus he said that tentacular cirri may be present or absent. In only one case, that of Eitnice teretiuscula, is it definitely stated that they are absent, though they are not mentioned in the three other species which Grube enumerates. But four species of Marphysa and five of Eunice in one collection is so disproportionate that I am inclined to think that M. teretiuscula is the only true Marphysa here. In any case Schmarda's descriptions are so short and his figures so rough that in most instances it is not possible to compare them with others with any certainty. It is quite possible indeed that m y species M. simplex is the above-mentioned E. teretiuscula, both being from the Indian Ocean, but as certainty is not possible I have redescribed m y species de novo. The following references give the best available descriptions (mere notes are not inserted here unless important):- M. stragidum V. Grube. ' Annulata Semperiana,' p. 163. M. belli Ehlers. ' American Annelids' (U.S. Fishery Survey by the'Blake'). 1887. M. adenensis Gravier. " Polychetes de la Mer Rouge," Arch. Norn-, du Museum de Paris, 1900. M. mossambica {M. novce-hollandice) Grube. ' Annulata Semperiana.' Gravier, loc. cit. If 1 h -T I Mcintosh. ' Challenger' Reports, vol. xii. p. 299. * 3Iacduffi,a bonhardi (Mcintosh, ' Challenger' Reports, vol. xii.) should be inserted here. Its main characteristic is the possession of four pairs only of well-developed gills. |