CHONDRACAXTHUS LISIANDjE. 175 



same kind of fish. Firth of Clyde and Moray Firth 

 (T. Scott). Irish Sea (,-1. Scott). 



7. Chondracanthus clavatus B asset t- Smith. 

 (Plate XL VII, fig. 7 ; Plate LVI, figs. 14, 15.) 



1896. Clio n dr -acanthus clavatus Basstt-Smith. (6) Ann. and Mag. 

 Nat. Hist. (6), vol. 18, p. 13, pi. v, fig. 6. 



1900. Chondracanthus clavatus T. Scott. (112) p. 165, pi. vii, figs. 

 35-37. 



1901. Chondracanthus clavatus A. Scott. (107) p. 351. 



Female. Body claviform, somewhat flattened, 

 anterior end narrow, expanded posteriorly. Head 

 oval or subcylindrical, rather longer than broad ; a 

 median dorsal line, quite distinct in some specimens, 

 extending backwards for some distance from the front 

 margin. Thorax about as long as the head, but rather 

 narrower and not very clearly defined ; the head and 

 thorax together equal to about two-fifths of the entire 

 length of the animal. Genital segment clavate, some- 

 what flattened, and gradually becoming broader towards 

 the posterior end ; postero-lateral prolongations narrow 

 and tolerably elongated, about equal in length to half 

 the width of the segment, and having a comparatively 

 wide space betAveen them. Abdomen very small, indis- 

 tinctly biarticulate. 



Antennules short, moderately stout, end joint not 

 clearly defined, provided' with a few minute apical 

 spines. Mandibles and other mouth - appendages 

 somewhat similar to those of Chondr acanthus cornutu*. 

 Thoracic legs small and rudimentary. Egg-strings 

 moderately elongated. Length 6' 5 mm. 



Mile. Very small; the cephalothorax is propor- 

 tionally greatly enlarged, and the abdomen short and 

 segmented. The antennas are armed with short, stout, 

 terminal hooks, and the maxillipeds are also similarly 

 armed. 



Habitat. Parasitic on the gills of lemon-soles 

 (Plenronectes mierocephalus). Plymouth (Baxsett- 

 Smith). Firths of Forth and Clyde (T. Scott). Irish 

 Sea (A. Scott). 



