196 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



the other fishes. One of these was dissected and a few 

 Clavella were found attached to the gill filaments. In 

 general appearance the parasite resembles van Beneden's 

 species which we have already recorded for the Irish Sea 

 from another kind of wrasse. Onr first specimens were 

 found on the gills of the Ballan wrasse (Labrus bergylta). 

 The present species is a very small one, and is only 1 mm. 

 in length, exclusive of the egg sacs. The species has 

 only one pair of maxillipedes. The antennules are five 

 jointed and armed with short spatulate hairs, the first 

 joint has a short, thick hair placed on the lower margin 

 near the junction with the second joint. The antenna 

 are in the form of very strong slender hooks. The 

 mandibles and maxilla are rudimentary; the former 

 appears to have no serrate apex. There are two pairs of 

 rudimentary feet, both two-branched. The first pair 

 has both branches composed of two joints, while the 

 second pair has a two-jointed outer branch, and a three- 

 jointed inner branch. The furca are very small and 

 inconspicuous. No males were found. 



