78 Canon A. M. Norman — Revised Nomenclature of VIII. — Revised Nomenclature of the Species described in Bate and Wesfwood^s ' British Sessile-eijed Crustacea.'' By Canon A. M. NoRMAN, M.A., D.C.L., LL.D., F.R.S. The work of Bate and Westwood from the first presented great difficulties to the student of the Amphipoda and Isopoda in consequence of the unsatisfactory figures and inadequate descriptions of many of the species. Moreover, with iu-creasino-knowledge of these Crustacea extensive changes in nomenclature have become necessary. Hence there lies a heavy stumbling-block in the way of any carcinologist who commences the study of the species represented in our fauna, and only an adequate knowledge of all that during recent years has been written on the subject can at the present time enable the species described in this work to be correctly named. Tlie object of the present paper is to remove, at any rate partially, this difficulty and bring the nomenclature of Bate and Westwood into juxtaposition with the names which are now employed for the several species. I have, of course, availed myself of all that has been written on the subject by carcinologists, such as the Rev. T. K. E.. Stebbing, Mr. A. O. Walker, and others in our own country, and by Professor G. O. Sars and M. Chevreux and others on the Continent, and 1 trust that I shall moreover be able to throw fresh light on the relationship of certain species which have hitlierto not received full elucidation. There have been very large additions to our knowledge of the species of these two orders which inhabit our seas during recent years, but with such additions these notes have nothing to do. One new genus is here introduced — Coremapus {Kopijixa, a brush, and 770^9, a foot). Allied to M icrodeutopus ; first gnathopods the largest, complexly subchelate in male and simply subchelate in female as in that genus, but the second gnathopods in both sexes narrow, scarcely subchelate, terminating in a rninute nail, the limb forming a brush, the meros, carpus, and nianus being densely setose, especially the meros, which is much produced over the carpus. Type, Coremapus {Microdeutopus) versiculatus, Bate. In the earlier part of this paper the species are taken in the order in which thuy aie arranged in our authors' work; the nomenclature, where necessary, is corrected and a number prefixed. Ill the latter part the species with their corrected names
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