CHONDKACANTHUS SOLE2E. 171 



Female. Body tolerably robust ; head subtrian- 

 gular, narrow in front, widest behind, its length 

 scarcely equal to the width. Thorax short, composed 

 of two fairly-distinct segments ; the head and thorax 

 combined, equal to rather more than half the length of 

 the genital segment ; this segment robust, somewhat 

 flattened and divided by a distinct transverse constric- 

 tion into two nearly equal portions ; the postero- 

 lateral corners of the distal portion produced back- 

 wards into straight and narrow prolongations the 

 length of which is more than half the width of the 

 segment. Abdomen very small, biarticulated, and 

 considerably shorter than the lateral prolongations of 

 the genital segment. 



Antennules uniarticulate, conspicuous, but not very 

 robust, and furnished with a few minute subapical 

 setas. Antennas short, stout, and ending in short 

 claw-like spines. Mandibles and other mouth-appen- 

 dages somewhat similar to those of Gliundro cantlius 

 cornutus. Both pairs of thoracic legs tolerably elon- 

 gated, but rudimentary in structure. Length about 

 8 mm. Egg-strings about the same length. 



Male. The male of this species is very small and 

 similar to that of Ghondr acanthus cornutn* ; the appen- 

 dages are also similar except that the antennules have 

 the basal joint considerably enlarged and subtrian- 

 gular, while the end joint is very small and bears a 

 few minute setae. 



Habitat. Parasitic on the gills of the black sole 

 (Solea vulgaris), and only occasionally on other flat 

 fishes. Starcross, Devon, on a dab (C. Parker in Mus. 

 Normanianum). On Solea vnlgaris, Plymouth (Bussett- 

 Smith). Firth of Clyde (T. Scott). Irish Sea (A. Scott). 



4. Chondracanthus flurae Kroyer. 

 (Plate XL VII, fig. 5; Plate LIII, figs. 10, 11.) 



1863. Chondracantlius flur* Kroyer. (71) p. 249, pi. xiii, figs. 7 a-cl. 

 1900. Chondracanthus flurx T. Scott, (112) p. 16<x pi. vii, figs. 32-34. 



Female. The head and thoracic segments narrow 



