144 BRITISH PARASITIC COPEPODA. 



of the localities where this Lernaea has been obtained : 

 Dublin and Belfast Bays (W. Thompson). Polperro 

 and Falmouth (A. M. Norman). Plymouth (BasseU- 

 Smith). Various parts of the Scottish and Lancashire 

 coasts (nob.). Coasts of Northumberland and Durham 

 (Brady fy Norman). Four adult female Lern&a branchi- 

 alis were obtained from the gill-arches of twenty-four 

 Callionijmus lijra and one on the gill-arches of a Gentro- 

 notus gujmellus which were captured in the Irish Sea 

 in 1910 (.4. Scott). 



2. Lernsea lusci Bassett- Smith. 

 (Plate XLIV, figs. 1, 2.) 



1896. Lem&a lusci Bassett-Smith. (6) p. 13, pi. iv, fig. 6. 

 1904. Lerneea lusci T. Scott. (115) p. 277, pi. xvii, figs. 12, 13. 



Female. Horns of the cephalon unequally developed, 

 stout, and not so branching as in Ler-naea branchialis ; 

 very short, except the one which springs from the dorsal 

 aspect of the cephalon, this branch, which is tolerably 

 elongated, extends outwards at nearly right angles 

 to the neck, and is narrow and lihguliform with the 

 margins irregularly lobed and reflexed ; the other horns 

 very short and terminating in one or two rudimentary 

 branches. Neck moderately short and thick, merging 

 posteriorly and directly into the genital segment ; this 

 segment being proportionally considerably swollen and 

 at first abruptly reflexed and bent upon itself, except 

 at the distal end, where, in marked contrast to Lernsea 

 branchialis, it is only slightly curved. The twisted egg- 

 strings are also proportionally less slender than those 

 of that species. 



The antennas and other cephalothoracic organs 

 appear to be somewhat similar to those of Lernsea 

 branchialis. Length of the female represented by the 

 drawing (PL XLIV, fig. 1) only a little over half an 

 inch (or about 15 mm.), measuring from the head to 

 the end of the genital segment. Colour dark red. 



Habitat. Parasitic usually on the gill-arches of 



