SEP ^' 189i 



[ 419 ] 



V, A Bevision of the British Copepoda heJoiiging to the Genera Bradya, Boeck, and 

 Ectinosoma, Boeck. By Thomas Scott, F.L.S., Hem. Soc. Zool. France, Naturalist 

 to the FisJiery Board for Scotland, ««(/ Andrew Scott, Fisheries Assistant, Unioersity 

 College, Licerpool. 



(Plates 35-38.) 



Bead 19tli November, 1894. 



Introductory. 



IN the course of our study of tlie British Entomostraca during- tlie past few years, we 

 have observed fi'om time to time specim.ens of Copepoda belonging apparently to one or 

 other of the genera Bradya and Ectinosoma, wliicli, so far as known to us, could not 

 be identified Avith any of the described species of eitlier of these two genera. Moreover, 

 as considerable dilBculty was sometimes experienced by iis in satisfactorily diagnosing 

 the characters by which these sjoccimens differed from, and by which they agreed with, 

 species already described, it was decided to delay beginning a critical study of the 

 several forms which had been observed until, if possible, a more extended inquiry had 

 been made. With this object in view, gatherings of tow-netted and dredged material 

 from various jilaces around our coasts have been examined as opportunities occurred, and 

 numerous specimens collected. Careful dissections have been made of all doubtful forms, 

 and, wherever necessary, accurate detailed drawings have been prepared. The results of 

 these researches we now propose to lay before the Linnean Society in the form of a 

 revision of the British Copepoda belonging to the genera Bradya and Ectinosoma, 

 with flgiu'es of all the species described. 



We have described and figured the few species already described and figured in works 

 on British Copejjoda as well as those which, so far as we know, are new to science, in 

 order to bring into prominence certain obscure jioints not fully illustrated in previous 

 works, as well as to allow of the various species, old and new, being compared with 

 each otlier, with greater certainty and ease. 



Though this revision has been the result of much careful research, it cannot be 

 considered exhaustive; but if it tends to simplify the study of these two somewhat 

 troublesome genera we shall feel amply rewarded for our labours. 



We projiose to take the genus Bradya first, as the structure of the anterior foot-jaws 

 in this genus shows, in our opinion, a closer affiuity with the Calanidce than does that 

 of theu' homoloo-ues in Ectinosoma. 



SECOND SERIES. — ZOOLOGY, VOL. VI. 56 



