288 Part III. — Twentieth- Annual Report 



TY.— NOTES ON SOME PARASITES OF FISHES. 



By Thomas Scott, F.L.S., Mem. Zool. Soc. de France. 



Plates XII. and XIII. 



In continuation of my Notes on the Parasites of Fishes I propose to 

 notice here several species not previously recorded, a few of which appear 

 to be undescribed, while some others have not, so far as I am avrare, been 

 recorded from the coast of Scotland. 



With the exception of two interesting Trematodes, all the species 

 belong to the Copepoda, and include three species belonging to the 

 family ErgasilidtB ; four species belonging to the Caligidfc ; five belonging 

 to the Dichelestidse ; two to the Chondracanthidfe ; one to the Lernaeidse ; 

 and two to the Lernseopodse. 



The Trematodes, which are described separately at the end of the 

 paper, belong to the two genera CaUicoiyle, Diesing and Acanthocotyle, 

 Monticelli ; the first has not been recorded hitherto from Scottish waters, 

 and the second is new to science. 



I. 



COPEPODA PAKASITA. 



Fam. Ergasiliuj:. 



Genus Bomolochus, Nordman (1832). 



The only member of the genus Bomolochus which appears to have been 

 recorded in the Crustacean fauna of the British Islands is the Bomolochus 

 soJeie of Claus. This species was described (and figured) in the Eleventh 

 Annual Report of the Fishery Board for Scotland, 1893,* it was taken on 

 tlie back of Solea vulgaris, Guun., captured in the Firths of Forth and 

 Clyde, as well as on the same species of fish captured in the Humber near 

 Grimsby. In the Nineteenth Annual Report I have recorded what 

 appears to be the same species of Bomolochus from the nostrils of several 

 kinds of fishes, and the form which I am now to describe from the nostrils 

 of the Ling, Molua violva, L., may also be merely a variety of the same 

 Bomolochus, but I record it hero in order to point out one or two 

 differences and also to correct one or two errors in the former description 

 of the species. Two other species are recorded here which are apparently 

 undescribed. 



Bomolochus solece, Claus (var. from Nostrils of Ling) PI. XIIL, figs. 13-18. 



1864. Bomolochus solew, Claus, Zeitschrift fur Wissenschaft. 

 Zool., vol. xiv., p. 374, pi. 35, figs. 6-20. 



The length of the female represented by the drawing (fig. 13) is 1-6 mm. 

 (about -^ of an inch). The antennules (fig. 14) and antennse are 



* Additions to the fauna of the Firth of Forth ; Eleventh Annual Report of the Fishery 

 Board for Scotland, Part III., p. 21'2, pi. v., fig. 1-13. 



