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Show 518 REV. T. R. R. STEBBING ON CRUSTACEANS [May 22, None the less, the specimens, in ample variety, which have rewarded Mr. Vallentin's assiduous and systematic researches, serve to throw new and much needed light on many interesting questions. At least in tbe single group of the Malacostraca I have found so much to say on a dozen species, of which only one is new, that the discussion and description of numerous other species must, be left over to some future opportunity. It cau scarcely be regarded as a reproach to the earlier naturalists that they had not prophetic eyes to make them acquainted with the requirements of modern classification. We are perhaps industriously preparing equivalent stumbling-blocks for a future age, which possibly will only care to distinguish species by the internal structure as seen working in the living animal under the Eontgen rays. But for the difficulty of identifying forms described by our predecessors, we ought not to lay all the blame on the imperfection of the original accounts. It should be shared by the naturalists who sometimes in a long succession are content to quote the name of a species, without using the means at their disposal of making it thoroughly well-known. There is a sort of superstition that a new species is worth publishing, but that to deal with one to which some other person's name and some ancient date is attached, is a poor affair, stale and unprofitable. There are indeed some specimens in Mr. Vallentin's collection to which these remarks will not apply, such as Serolis paradoxa (Fabricius), re-described by Beddard in his ' Challenger' Eeport on the Isopoda. Among the Amphipoda there is the well-marked Talorchestia scutigerula (Dana), and there is Dana's Iphimedia nodosa, a beautiful species, easily identified with Dana's account specifically, though the genus remained doubtful till a specimen was available for dissection. These are mentioned to indicate that the interest of the specimens gathered is by no means exhausted n the present paper. BEACHYUBA. CYCLOMETOPA. Fam. ATELECYCLULE. 1893. Atelecyclidce, Ortmann, Zool. Jahrb. vol. vii. p. 421. 1896. Atelecijclidcv, Ortmann, Zool. Jahrb. vol. ix. p. 444. 1899. Atelecyclince (subfam. of Caucridae), Alcock, J. Asiat. Soc. Bengal, vol. lxviii. pt. 2, p. 96. Ortmann defines this family as follows :-" Inner antenna? longitudinal. Outer antennae occupying the interior hiatus of the orbits, their second joint cylindrical, just reaching the front, the third joint only a little smaller ; flagellum hairy. Cephalothorax rounded, not widened, antero-lateral margin at least as long as the postero-lateral." H e places it among the Cancrini, his second subsection of the Cyclometopa, which in his system form the second section of the Cancroidea, these latter being the second subdivision of the |