296 Part III. — Twentietli, Anmud Report 



ot the second basal joint is furnished with two small but moderately 

 stout spines ; the first joint of the outer branches is, proportionally, con- 

 siderably larger than either the second or third joints, and the inner 

 branches are more slender (fig. 9). 



The second pair are similar to the same pair in Eudactylina acuta, but 

 the inner branches are proportionally smaller (fig. 10). 



The third and fourth pairs are also similar to those of the species 

 referred to (fig. 11). 



The fifth pair are larger than those of Eudactylina acuta, and they are 

 also proportionally broader, the width being about equal to four-fifths of 

 the length, as shown in the drawing (fig. 12). 



The caudal furca, which are equal to about twice the length of the last 

 abdominal segment, are narrow and slightly curved ; they are widest at 

 the base, but the width is scarcely equal to half the length ; they taper 

 gradually to the blunt-pointed apex, and carry two or three minute spines 

 (fig. 13). 



Description of the Male. — Length 1*9 mm. (about yL- of an inch), being 

 only about three-fourths the length of the female. The body is more 

 slender than that of the female, while the abdomen is about equal in 

 length to the cephalo-thorax (fig. 2). 



The antennules are moderately stout, and appear to be seven-jointed ; 

 they do not taper as much as the antennules of the female, but are pro- 

 vided with somewhat similar spines ; they also differ from the female 

 antennules in being furnished with a short but strong hooked claw at the 

 distal extremity (fig. 14). 



The antennaj and mouth appendages are somewhat like those of the 

 female, with the exception of the second maxillipeds, which resemble 

 the same appendages in Charopinas ramosus (fig. 15). 



The first four pairs of thoracic feet have both branches apparently 

 three-jointed, but in the outer branches of the first pair the articulation 

 between the second and third joints is somewhat indistinct (fig, 16). 

 The inner branches of the second pair are armed on the inner aspect with 

 a moderately stout and elongated curved spine, which springs from the 

 distal angle of the first joint (Hg. 17). 



The third and fourth pairs have somewhat slender branches ; the inner 

 are furnished with two terminal spiniform setie, the outer bear two ter- 

 minal setse and a spine ; a moderately stout spine also springs from the 

 outer distal angles of the first and second joints (fig. 18). 



The fifth pair are somewhat similar to those of the female. 



The caudal furca are very narrow, and armed with small and slightly- 

 hooked terminal spines (fig. 19 — see also fig. 2). 



Habitat.— On the gills of Raia radiata, Don. (the Starry Uay), cap- 

 tured to the east of the Shetland Islands on May 22nd, and oflf Aberdeen 

 on JS'ovember 29th, 1901 ; both females and males of this Eudactyline 

 were obtained, and specimens were moderately frequent on the gills of 

 some of the tarry Rays examined. 



Eudactylina similis, though it resembles Eudactylina acuta in general 

 appearance, may be readily distinguished from it by the difference in the 

 form of the caudal furca. 



Eudactylina acanthii, A. Scott. PI. XIII., figs. 1-9. 



1901. Eudactylina acanthii, A. Scott, 15th Ann. Kept, of the 

 L.M.B.C., and their Biol. Stat, at Port Erin, Isle of Man, 

 Dec, 1901, p. 14. 



Description of the Female. — Length about 2 mm. (2^- of an inch). 

 Body moderately stout, the cephalothoracic segment about one and a half 



