38 BRITISH PARASITIC COPEPODA. 



found much more frequently in the nostrils of the cod 

 than in those of any other fish we have examined. 

 The following is a list of the fishes on which we have 

 obtained this Bomolochus : 



1. Lumpsucker, Cyclopterus lumpus L., in the 

 nostrils, rather rare. 



2. Cod fish, Gadus ccdlarius L., in the nostrils, fre- 

 quent. 



3. Haddock, Gadus seglefinvs L., in the nostrils, not 

 common. 



4. Whiting, Gadus merlangus L., in the nostrils, 

 not common. 



5. Pollack or lythe, Gadns pollachius L., in the 

 nostrils, moderately frequent. 



6. Ling, Molua molva L., in the nostrils, not com- 

 mon. 



7. Plaice, Pleuronectes platessa L., in the nostrils, 

 not very rare. 



8. Flounder, Pleuronectes flesns L., in the nostrils, 

 rare. 



9. Common or black sole, Solea vulgaris Quen., on 

 the back of the fish, not common. 



Bomolochus soleae has heen obtained at various places round 

 the British Islands on one or other of the fishes mentioned. 

 The specimens obtained on the ling-fish are rather larger 

 than the typical form from the black sole or the cod-fish, but 

 they do not appear to differ much otherwise. As many as 

 twenty-nine specimens of Bomolochus have been obtained in 

 the nostrils of a single large cod-fish captured in the Moray 

 Firth. Frequently, not only adult males and females (the 

 latter commonly with ovisacs), but also young ones in all 

 stages of development, may be observed in the nostrils of the 

 cod-fish, thus indicating clearly enough that their presence in 

 this curious domicile is not accidental, and that they find the 

 conditions of life fairly satisfactory amid such surroundings, 

 even though the accommodation is somewhat limited. This 

 habit on the part of the Bomolochus is the more interesting 

 when there is apparently nothing to hinder them from leaving 

 the nostrils of the fish. They can move about freely amongst 

 the mucus with which the nostrils are usually well supplied, 

 and if they be removed and placed in a vessel of clear sea- 



