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. 

 Antennae short, stout, and armed with bluntly -pointed 

 claws. Mandibles similar to those of Chondracanthus 

 comutus; 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 

 with a few short marginal spines and a fascicle of 

 tolerably long apical setae. Antennae 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 batis), captured in the North Sea 

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

 North Shields (Miss M. leboiir)* 



3. Chondracanthus soleae Kroyer. 

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



.838. Chondracanthus soleve Kroyer. (70) vol. ii, p. 139, pi. iii, fig. 4. 

 1863. Chondracanthus solese idem. (71) p. 256. 



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

 1906. Chondracanthus soleae Norman & T. Scott. (88) p. 217. 



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

 p. 156 (1909). 



