SEA-FISHERIES LABORATORY. 195 



Lernanthropus kroyeri, van Beneden. Plate III. 



We find this parasite occasionally attached to the 

 gills of Bass (Labrax lupus), caught at the entrance to 

 Barrow Channel. When living the animal is a dark red 

 colour, and rather difficult to see. It differs from any of 

 the other ecto-fish parasites with which I am acquainted 

 by the possession of a peculiar appendage situated close 

 to the base of the antennules of both sexes. The 

 appendage is of irregular shape, somewhat pointed 

 towards the apex, and apparently composed of two joints. 

 Its situation and structure are shown by fig. 3 on the 

 plate. The female is about 21'7 mm. in length, inclusive of 

 the thoracic appendages. The male is rather different from 

 the female and is about 10*5 mm. long. It apparently 

 lives as a parasite on the female. I have never come 

 across any that were isolated, and living directly on 

 the gills of the fish. The appendages are nearly identical 

 in the two sexes. They consist of one pair of seven- 

 jointed antennules, with secondary processes, one pair of 

 antenna?, one pair of mandibles enclosed in a suctorial 

 tube, one pair of maxilla?, two pairs of maxillipedes, and 

 two pairs of rudimentary feet. The outer branch of the 

 second pair of feet of the male has a slightly different 

 armature from that found on the second pair of the female. 

 The outer branch of the female second foot is armed with 

 four spines, while the male has two small spines and a 

 number of minute teeth at the apex of the branch, The 

 furca are large and conspicuous. The spermatophores 

 frequently found attached to the female are globular in 

 shape, and of a dark brown colour. 



Clayella labracis ?, van Beneden. Plate IV. 



While trawling in Luce Bay for large plaice tor the 

 tanks, a few Crenilabrus melops were captured amongst 



