of the Fisher 1/ Board for Scotland. 293 



outwardly on each side so as to form distinct angular projections and give 

 to the segment, when seen from above, a kind of diamond-sliaped outline. 

 The " f'enital " segment is fully three times the length of the cephalic 

 segment, its breadth is not much more than a thitd of the length, and its 

 margins curve gently towards both ends. The abdomen is very small, 

 and so also are the furcal joints. The ovisacs appear to be moderately 

 elongated, but in none of the specimens examined were the ovisacs 

 entire. 



The antennules are short and moderately stout, ami composed of five 

 joints. The first joint is large, and nearly equal to half the entire length 

 of the antennule. The lower distal angle of this joint is produced down- 

 wards in the form of a strong hook. The three last joints are sub-equal 

 and shorter than the second, Several short and dagger-like spines spring 

 from the upper margins of the antennules as shown in the drawing 



The antenucB (fig. 12) are somewhat similar to those of Clavella 

 cluthiv, and, like them, are armed with strongly-curved terminal hooks. 



Habitat. — On the gills of the Striped Wrasse, Labrus mi.ctus, Lin,, 

 captured in the Clyde, near Ayr, in January, 1900, and forwarded to the 

 Laboratory by Robert Duthie, Fishery Ofhcer, Girvan. Taken also on 

 the gills of Labrus mixtus captured in the Irish Sea (A. Scott). 



Remarks. — The angular form of the cephalic segment, and the strong 

 hook on the first joint of the antennules, seem to be characteristic of 

 Clavella labracis. This copepod has lately been recorded from the Irish 

 Sea, from the gills of the Striped Wrasse,* and as Professor van Beneden 

 speaks of it as abundant on the gills both of Labrus beryijlta and Labrus 

 mixtusf, it seems probable that its distribution is co-extensive with 

 that of its hosts. 



Genus Eudadylina, Van Beneden (1853). 



Eudactijlina acuta, Van Beneden. PI. XEL, figs. 20-25. 



1853. Eudactylina acuta, Van Beneden, Bull. Acad. Roy. Belg., 

 vol. XX., pt. 1, p. 235; Mem. Acad. Roy. Belg. (1861), 

 p. 150, pi. XXV. 



Description of the Female. — Length about 2 "6 mm. (fully -pV ^^ ^^ 

 inch). The body is slender and elongated, the thoracic portion consists 

 of five distinct segments, and the abdomen of three (including the 

 genital segment). The first body segment is about equal to the 

 combined lengths of the next two, but the second is smaller than the 

 third ; the fourth is about equal in length to the first and only slightly 

 longer than the fifth segment ; the abdomen is very small, being equal to 

 little more than a fourth of the entire length of the thorax. The furcal 

 plates are short and dilated (fig 20). 



The antennules are short, very stout, and apparently four-or five- 

 jointed, and they are armed with several strong spines. A large 

 strongly-curved spine springs from the upper distal angle of wdiat 

 appears to be the second basal joint, and reaches to near the end of the 

 next joint, there is also a stout and much shorter spine on the lateral 

 aspect of the same joint, and also one or two spiniform setae ; a 

 moderately stout, elongate, and nearly straight spine springs from the 

 upper distal angle of the following joint, while behind and below this 

 spine there is another, which is also moderately stout, but only about half 



* Fifteenth Annual Keport L.M.B.C., and their Biol. Station at Port Erin (Isle of Man) 

 Dec, 1901, p. 13. 

 tLes PoisJons desCote.jdoBelgiquo, J/ew. Acad. Roy. ZJf/y., vol.xx.xviii., pp. 45, 46 (1870). 



