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Show 806 THE MARQUIS D E FOLIN O N T H E [Dec. 16, extreme Ritualist party in ornithology, who attempt to carry the Stricklandian code regardless of consequences, Bonaparte's name would hang in terror em over Sclater's, to be substituted for it as soon as it could be proved that it certainly referred to the same species; or, following the practice of the blindest followers of this unfortunate innovation, Bonaparte's name would at once be given the benefit of the doubt, regardless of the fact that it had been extensively applied to a different species. I cannot for a moment lend myself to such ornithological immorality, and must look upon Bonaparte's name as one tainted for ever, and debarred for the future from being used for any species of Thrush. In the fully adult male of T. hortulorum, Sclater, the general colour of the upper parts is a dull slate-grey, shading on the sides of the neck into a very pale slate-grey on the throat and chest. The axillaries, under wing-coverts, and flanks are brilliant orange-chestnut, shading into white on the centre of the belly and under tail-coverts. The female and immature male are undistinguishable from those of T. dissimilis (Blyth). 7. On the Mollusca of H.M.S. < Challenger' Expedition.- The CJECID^E, comprising the genera Parastrophia, Wat-sonia, and Caecum. By the M A R Q U I S D E FOLIN. With a Prefatory Note by the Rev. R O B E R T B O O G W A T S O N, B.A., F.R.S.E., F.L.S., & c (Published by permission of the Lords Commissioners of the Treasury.) [Received November 25, 1879.] [The Caecidse are a group of shallow-water Mollusca, enormously numerous in individuals but hitherto poor in species. As was natural, very few indeed presented themselves in the ' Challenger' dredgings ; and these I had great pleasure in intrusting to one who has so specially made the group his study as the Marquis de Folin. His acquaintance with the subject in general, and his own vast collection of specimens gathered from every quarter of the globe, are the pledges that in what he has now produced nothing known on the subject has been overlooked ; and even those who may hesitate to accept in full his classification will recognize both the general value of this monograph, and the extraordinary perfection with which he has delineated the specimens. ROBERT B O O G WATSON.] 1. PARASTROPHIA CHALLENGERI, n. sp. St. 186. Sept. 8, 1874. Lat. 10° 30' S., long. 142° 18' E. Wednesday Island, Cape York. 8 fms. Coral-sand. Temperature of sea at the surface 77°*2 F. One specimen. Testa minuta, tubularis, tricurvata, subopaca, alba, nitida, |