CHONDKACANTHUS SOLEJE. 171 



. 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- 

 Avards into straight and narrow prolongations the 

 length of Avhich 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 

 setae. Antenna? short, stout, and ending in short 

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

 dages someAvhat similar to those of Chondracanthus 

 cornutns. 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 Ohondracanthu* cornutux ; the appen- 

 dages are also similar except that the antennules have 

 the basal joint considerably enlarged and subtrian- 

 gular, AA'hile the end joint is very small and bears a 

 few minute seta3. 



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 irulgaria, Plymouth (Itawtt- 

 Rmitlt). Firth of Clyde (T. Scott). Irish Sea (A. Scott}. 



4. Chondracanthus flurae Kroyer. 

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



1863. Chondracanthus flurie Kroyer. (71) p. 249, pi. xiii, figs. 7 a-d. 

 1900. Chondracanthus fane T. Scott. (112) p. 166, pi. vii, figs. :12-:51. 



l-''-in<ili'. The head and thoracic segments narroAv 



