120 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Lepeophtheirus polltichii, Bassett Smith. 



Attached to the inside of the mouth of the pollack. 



Trebius caudatus, Kroyer. 



On the skin and inside the mouth of various species of 

 Raia. The pink colour of the living animal renders its 

 presence easily visible to the naked eye. 



Ech ih rogaleus coleoptratus (Guerin) . 



On the skin of the picked dog-fish, Squalus acanthias, 

 but not of very frequent occurrence. The ovisacs are very 

 slender and of great length. 



Pandarus bicolor, Leach. 



Also occasionally found on the skin of the picked 

 dog-fish. It has been recorded by other observers from 

 Galeus cards (tope), Scyllium catulus (greater spotted 

 dog-fish), and Carcharias glaucus (the blue shark). 



Dichelestium sturionis, Kroyer. 



A large white cylindrical species only found in the 

 gill chamber of the sturgeon. The fish is not often 

 caught in the district, and this makes the parasite rather 

 rare. 



Clavella labracis, van Beneden. 



This is a very small parasite, egg-bearing females 

 being scarcely one millimetre in length. It usually 

 occurs in abundance, however, and is found on the gills 

 of the wrasse, Labrus mixtus and L. maculattis. 



Cycnus pallidus (van Beneden). 



A small slender species, sometimes very common, on 

 the gills of conger. 



Eudactylina acuta, van Beneden. 



Attached to the gills of the angel-fish, Rhina 

 squatina. A number of specimens are found on each 

 moderately-sized fish. 



