of the Fishery Board for Scotland. 27*7 



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 iu Eudactylina acuta, van Beneden, 

 are furnished with several transverse rows of minute spines and three 

 apical seta^ (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 specimsn of the " Sting Eay," Trygon 

 jpastinaxa, Linn., captured in the Dornoch Firth on October 22, 1903. 

 No males of the Eudactylina were observed. The fish, as already stated, 

 measured about 14| inches across the pectoral fins, while its length from 

 the snout to the extremity of the tail is about 24^ inches. 



Eemarks. — This Eudactylina 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 diflferences which separate it from other forms. 

 I will recapitulate one or two of these : it difi'ers in the proportional 

 lengths of the joints of the antennules, in the armature of the antennae, 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), 

 p. 150, PI. XXV. 



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 Eudactylina acuta on the gills of an 

 Angel-fish, RMna squatina (Lin.), captured in January 1902 about eight 

 or nine miles south-east from Bychan 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 Eudactyline is an addition to the parasitic 

 Oopepod-fauna of the Clyde. 



Lerncea lusci, Bassett-Smith. PI. xvii., figs. 12 and 13. 



1896. Lerncea lusci, Bassett-Smith, Ann. and Mag. Kat. Hist. 

 (6), vol. xviii., p. 13, pl. iv., fig. 6. 



The form described under this name is considerably smaller than the 



