210 BRITISH PARASITIC COPEPODA. 



obtained on the gill-arches of Trie/la lineata in the 

 Adriatic. 



6. Brachiella ovalis (Kroyer). 

 (Plate LX, fig. 7 ; Plate LXIII, figs. 26-30.) 



1837. Anchorella ovalis Kroyer. (70) p. 289, pi. iii, fig. 6. 

 1870. Anchorella ovalis P. J. van Beneden. (16) p. 31, pi. ii, fig. 8. 

 1901. Brachiella ovalis T. Scott. (113) p. 133, pi. vii, figs. 30-35. 

 1904. Brachiella ovalis A. Scott. (109) No. 12, p. 44. 



Female. Cephalothorax stout, moderately short, 

 but rather longer than the genital segment. Genital 

 segment subpyriform, considerably expanded pos- 

 teriorly and narrowed at the proximal end to nearly 

 the width of the cephalothorax ; the posterior margin 

 sloping backward slightly, and equally from both 

 sides, and forming an obtuse angle at the base of the 

 abdomen ; a short submedian appendage occurring on 

 each side of the abdomen midway between it and 

 origin of the subglobular egg-strings, these append- 

 ages usually being more or less concealed by the egg- 

 strings. Abdomen very small. 



Antennules apparently composed of four joints, the 

 first dilated and the others small, the third being 

 much shorter than either the second or fourth. 

 Antennae tolerably large ; end joint narrowly rounded 

 at the apex and covered with minute bristles, the 

 outer ramus consisting of two small subequal joints 

 bearing three very small apical spines. Mandibles 

 moderately stout and slightly expanded towards 

 the distal end, the inner margin at this end being^ 

 armed with a series of somewhat coarse teeth, 

 alternately larger and smaller. Maxilla3 and first 

 maxillipeds somewhat similar to those of Brachiella 

 triglse. Second maxillipeds very short, stout, and re- 

 curved, free except at the distal end, where they are 

 united to a chitinous plug fixed in the gill-arches of 

 the host. Length about 8 '5 mm. 



We have been unable to obtain the male of this species. 



Habitat. Parasitic on the gill-arches of Trig la 



