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 



