118 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



glass with water, the copepods, if present, can easily be 

 seen. 



Caligus curtus, Miiller. 



A very common species, and may be found on various 

 kinds of fishes, cod, ling, hake, plaice, &c. 



Caligus rapax, M. Edwards. 



Also a very common species and as widely distributed 

 amongst fishes as the former. The males and immature 

 females are often taken in tow-net collections. 



( 'aligns diaphanus, Nordmann. 



In the gill chamber of the common gurnard and 

 yellow gurnard, occasionally moderately frequent. 



Caligus gurnardi, Kroyer. 



The only record of this species from the district is 

 the one by my late colleague and fellow-worker, I. C. 

 Thompson, whose reports have been of much service in the 

 preparation of the present list. The specimen was 

 obtained from dredged material and had evidently been 

 detached from its host. 



Caligus brevicaudaius, A. Scott. 



This is a moderately large species, 5"3 mm., and has 

 only so far been found in the mouth of the common gur- 

 nards caught at Piel. 



Caligus labracis, T. Scott. 



Frequently found attached to the gills of the wrasse. 

 Caligus scomber i, Bassett Smith. 



Occasionally found in the gill chamber of the 

 mackerel. 



Caligus minimus, Otto. 



This well-marked species is sometimes very common 

 in the mouth of the bass, Labrax lupus. 



