Section V, 1919 [45] Trans. R.S.C. 



Copepods Parasitic on Fish from the Vancouver Island Region 



By C. McLean Fraser, Ph.D., F. R.S.C. 



(Read May Meeting, 1919.) 



In "Contributions to Canadian Biology, 1906-1910," a paper 

 by Dr. C. B. Wilson was published, under the title, "Parasitic Cope- 

 pods from Nanaimo, British Columbia, including eight species new 

 to science." This report was based on a number of specimens sent 

 from the Biological Station by the late Rev. G. W. Taylor. Since 

 this publication appeared, although no systematic attempt has been 

 made to collect copepods, quite a large number has accummulated. 

 The additions to the collection include many specimens of species 

 that appear to be new as well as those already described, and it is 

 well that they should be reported, although it is fully recognized that 

 even the list to date is far from being a complete list of the copepods 

 that are to be found on the fiish that inhabit the waters of the strait of 

 Georgia in the vicinity of the station. 



Wilson listed 13 species. To those 13 more are added, 11 of them 

 new and 2 already described but not reported from this region. The 

 11 new species are: — Bomolochus cuneatns, Ergasiliis twgidus, Lepe- 

 ophtheirus bifidus, L. breviventris, L. hospitalis, L. parvicruris, Chon- 

 dracanthus deltoideus, C. gracilis, C. irregularis, C. rectangularis and 

 Nectobrachia indivisa (Nectobrachia, a new genus). The two not 

 previously reported are: — Caligus gurnardi and Echthrogaleus coleo- 

 ptratus. The male of Lepeophtheirus nanaimoensis has also been 

 found. In some cases, copepods already reported, have been found 

 on hosts other than those from which they were first reported. 



The list here presented includes those in Wilson's list as well as 

 those now reported from the vicinity for the first time. 



Family ERGASILID^ 

 Bomolochus cuneatus new species 

 PI. I, Figs. 1-11 



Female. — General body form cuneate, tapering very regularly 

 from the anterior to the posterior. Céphalothorax slightly narrower 

 and more rounded anteriorly than posteriorly, length two-thirds 

 width. The carapace does not cover the first antennae but a small 

 lobe projects between the bases. Second, third, fourth and fifth 



