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Show 422 PROF. F. J. BELL ON T H E TEMNOPLEURIDAE. [June 1, Barcelona. It having been stated by some gentlemen who Professor Huxley's paper read, that Crayfishes were certainly supplied to the Madrid market, I was led to move some of m y Spanish friends to make careful inquiries as to the localities whence these Madrid Crayfishes are obtained. The result showed that they are procured in considerable numbers at only a short distance from Madrid itself. The Crayfish appears to be unknown in the rivers Douro and Tagus, on the western side of the Peninsula, and in the Ebro on the eastern ; but it is found abundantly in the Talegones and Escalote, rivulets forming part of the sources of the Douro, in the Henares, one of the sources of the Tagus, and in the upper part of the Jalon, an important tributary of the Ebro. Widely separated, however, as these three rivers become in their courses to the sea, both east and west, the rivulets I have mentioned as forming their principal sources all take their rise within an area probably not more than twenty miles square, situated nearly in the centre of Spain, and about forty or fifty miles north-east of Madrid. It is from these small streams that the Madrid market is supplied by fishermen of Alhama, Siguenza, and Berlanga ; and these streams are the only ones well within the borders of the Peninsula in which, so far as I can discover, the Crayfish is to be found. As before mentioned, Crayfishes are said to be found about Barcelona; but it may possibly turn out that they are really caught in the small streams which, rising in the Pyrenees, afterwards unite to form the river near which Barcelona stauds. M y correspondents tell m e that they can obtain no information of the occurrence of the Crayfish south of Madrid ; and they add that if they were known to be found there the markets of the capital would not be solely supplied from the northern streams, as is now the case. The peculiar localization of these crustaceans in the centre of Spain suggests the idea of their having been specially introduced ; but experiments in acclimatization are, I believe, unknown in the Peninsula ; and without attempting any explanation of the difficulty, I may simply record the fact that the Crayfish is abundant in the rivulets within the limited area I have mentioned. 2. Observations on the Characters of the Echinoidea.-III. O n some Genera and Species of the Temnopleuridee. By F. J E F F R E Y B E L L , M.A., F.Z.S.,Professor of Comparative Anatomy m King's College. [Received April 24, 1880.] (Plate XLI.) For the purposes of present convenience I adopt the name Temnopleuridee for those forms which are grouped under it by Prof. Alex. Agassiz in his 'Revision of the Echini.' I need not now de- |