170 BRITISH PARASITIC COPEPODA. 



tion near the middle, with the postero-lateral corners 

 produced into short bluntly-rounded lobes ; a small 

 median projection on the dorsal aspect which conceals 

 the proximal part of the abdomen. Abdomen, which 

 is bisegmented, reaching to about the end of the 

 lateral lobes, and imparting a trilobed appearance to 

 the posterior end of the genital segment. 



Antennules considerably enlarged but showing very 

 little structure, and bearing a few small apical spines. 

 Antennaa short, stout, and armed with bluntly -pointed 

 claws. Mandibles similar to those of Chondracanthus 

 cornntus; maxillipeds also somewhat similar to those 

 of the same species. Both pairs of thoracic legs short 

 and rudimentary. Length about 14 mm. Colour pale 

 red. Egg-strings tolerably elongated. 



Male. The male of this species is proportionately 

 larger than that of the one previously described ; the 

 cephalothorax also greatly enlarged. Antennules 

 short, not very robust, uniarticulate and furnished 

 Avith a few short marginal spines and a fascicle of 

 tolerably long apical seta?. Antennse short, stout, and 

 armed with short but strong terminal hooks. Second 

 raaxillipeds strong, biarticulated, and provided with 

 terminal claws. Other thoracic appendages rudi- 

 mentary. Abdomen composed of three or four seg- 

 ments, but one or two are not very clearly defined. 

 Length about 3 mm. 



Habitat. Parasitic on the gills of large blue (or 

 grey) skates (Raia latis), captured in the North Sea 

 and landed at the Aberdeen Fish-Market (T. Scott). 

 North Shields (Miss M. Lelour).* 



3. Chondracanthus soleae Kroyer. 

 (Plate XLVII, fig. 4; Plate LIU, figs. 12-15.) 



1838. Chondracanthus solefe Kroyer. (70) vol. ii, p. 139, pi. iii, fig. 4. 

 1863. Chondracanthus sola? idem. (71) p. 256. 



1900. Chondracanthus sole* T. Scott, (112) p. 165, pi. vii, figs. 41-45. 

 1906. Chondracanthus sole* Norman & T. Scott. (83) p. 217. 



* See Norman & Brady's 'Crustacea of Northumberland and Durham/ 

 p. 156 (1909). 



