128 BRITISH PARASITIC COPEPODA. 



a moderately elongated seta at the apex ; the inner 

 ramus also provided with two spiniform apical setae, 

 and both rami furnished with marginal spinules as 

 shown in the drawings ; the armature of the rami of 

 the third and fourth pairs somewhat similar to that 

 described above, but in the second pair, while the 

 armature of the inner ramus does not differ materially 

 from that of the others, the outer ramus is devoid of 

 either spines or setae. Fifth pair small, uniarticulate, 

 lamelliform, and broadly ovate, situated on the lateral 

 aspect and near the distal end of the last thoracic 

 segment, each furnished with about three apical 

 setae and their outer margins fringed with minute 

 spines. Caudal rami short, nearly twice as long as 

 broad, with two short stout spines at the apex, a 

 small seta on the lower half of the outer margin, 

 and a fringe of minute prickles on the lower inner 

 margin. Length about 2*5 mm. Egg-strings toler- 

 ably slender aud elongated. Colour similar to that of 

 the gills, but the egg-strings are not so dark red. 



No males have been observed. 



Habitat. Parasitic on the gills of the angel-fish, 

 Rhiua squatina (Lirin.). Moray Firth and Firth of 

 Clyde (f. Scott). Irish Sea (A. Scott). Not rare. 



2. Eudactylina acanthi! A. Scott. 



(Plate XXXVII, figs. 2, 3 ; Plate XXXVIII, 

 figs. 6-12.) 



1901. Eudactylina acanthii A. Scott. (108) p. 14. 



1902. Eudactylina acanthii T. Scott. (114) p. 296, pi. xiii, figs. 1-9. 

 1904. Eudactylina acanthii A. Scott. (109) p. 41. 



Female. Body moderately stout, cephalothorax 

 equal to five times the length of the abdomen, in- 

 cluding the genital segment ; the first cephalothoracic 

 segment about one and a half times the length of the 

 next, the second and third subequal, the fourth rather 

 larger than the third or the following segment. Ab- 

 domen very short, consisting of three segments, the 



