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of the Fishery Board for Scotland. 267 
a single elongated terminal seta, there are a few spines on the outer 
margins of the second and third joints, while the first joint bears a fringe 
of minute spines along its outer edge (fig. 9). 
The fifth pair, which are broadly foliaceous and resemble in their 
general outline the same appendages in Hudactylina acuta, van Beneden, 
are furnished with several transverse rows of minute spines and three 
apical setz (fig. 10). 
The furcal joints, which are rather longer than the last abdominal seg- 
ment, are each of them armed with two terminal spines—a stout one at 
the apex and a somewhat smaller one on the outer edge, as shown in the 
figure; a small seta springs also from near the middle of the outer 
margin (fig. 11), 
Habitat.—On the gills of a specimen of the “Sting Ray,” Trygon 
pastinuca, Linn., captured in the Dornoch Firth on October 22, 1903. 
No males of the Hudactylina were observed. The fish, as already stated, 
measured about 144 inches acruss the pectoral fins, while its length from 
the snout to the extremity of the tail is about 244 inches. 
Remarks.—This Hudactylina appears to differ from previously described 
species by its smaller size—being little more than half the length of the 
smallest hitherto recorded, and from its being found on a different host. 
But there are also structural differences which separate it from other forms. 
I will recapitulate one or two of these: it differs in the proportional 
_ lengths of the joints of the antennules, in the armature of the autenne, in 
the armature of the first maxillipeds, in the structure of the second pair of 
thoracic feet, and in the proportional lengths of the segments of the thorax. 
Though a number of specimens were obtained, only a small proportion 
of them were in good condition for dissection. 
Eudactylina acuta, Van Beneden. 
1853. Eudactylina acuta, Van Beneden, Bull. Acad. Roy. Belg., 
vol. xx., pt. 1, p. 235; Mem. Acad. Roy. Belg. (1861), 
py boO, Ply sexy, 
In my notes on the parasites of fishes in Part III. of the Twentieth 
Annual Report of the Fishery Board for Scotland (published October 2nd, 
1902), I describe the occurrence of Hudactylina acuta on the gills of an 
Angel fish, Rhina squatina (Lin.), captured in January 1902 about eight 
or nine miles south-east from Buchan Ness, and the description of the 
parasite is illustrated by a series of drawings. My son had already 
obtained the same Eudactyline on the gills of Angel-fishes captured in 
the Irish Sea, but there did not appear to have been any previous record 
of it from Scotland. 
Through the kindness of Mr. Robert Duthie, Fishery Officer—presently 
stationed at Girvan, Ayrshire—I am enabled to record this interesting 
parasite for the second time from Scottish waters, which, like the speci- 
mens previously referred to, was found on the gills of an Angel-fish. 
This fish, which was captured by turbot-net fishermen in the seaward 
part of the Clyde estuary and landed at Girvan on May 25th (1904), was 
secured by Mr. Duthie, who kindly forwarded it to me for examination. 
The fish was an immature female, and measured two feet nine and a-half 
inches (nearly 83 centimetres) from the front of the head to the extremity 
of the caudal fin. This Hwdactyline is an addition to the parasitic 
Copepod-fauna of the Clyde. 
ss 
Lernea lusci, Bassett-Smith. Pl. xvii., figs. 12and 13. 
1896. Lernea lusct, Bassett-Smith, Ann. and Mag. Nat. Hist. 
(Ge vol. xviii., p. 13, pl. iv., fig. 6. 
The form described under this name is considerably smaller than the 
