214 BRITISH PARASITIC COPEPODA. 



pairs of antennae, placed at the end of the elongated 

 neck, or cephalothorax. The second maxillipeds, by 

 which the parasite fixes itself to its host, situated at 

 the base of the cephalothorax, and coalescent so that 

 they appear to consist of a single organ; this organ is 

 usually short, sometimes very small and papilliform, 

 and united at the tip to a horn-coloured chitinous plug 

 which penetrates the tissues of the fish. Genital seg- 

 ment usually unprovided with terminal or lateral pro- 

 cesses, but if present they are generally very small. 

 Abdomen obsolete or nearly so. Egg-strings moderately 

 elongated. 



Male. The male is very small and proportionally 

 shorter than the male of Bracliiella, which it more 

 nearly resembles than that of the genus Lerndeopo<l<i ; 

 the dorsum, however, is more boldly arched, and the 

 height is usually greater than the length. The append- 

 ages of the cephalon and thorax are somewhat similar 

 to those of the male of BracldeUn. 



The genus comprises a large number of species, and those 

 described below have been obtained on British fishes. 



1. Clavella uncinata (0. F. Midler). 

 (Plate LXV, figs. 2, 3, 6 ; Plate LXVI, figs. 21-23.) 



1777. Lernxa uncinata O. F. Miiller. (85) p. 120, pi. xxxiii, fig. 2. 



1815. Schist urns uncinatus Oken. (91) part iii, p. 183. 



1815. Clavella uncinata idem. (91) part iii, p. (?) 357. 



1817. Ancliorella uncinata Cuv. (37) Icon, du Regne Anim., pi. 9, 

 fig. 5. 



1822. Lerneomyzon uncinatum Blainville. (24) Journ. de Physique, 

 vol. 95, p. 438. 



1832. Anchorella uncinata Nordmann. (89) p. 102, pi. 8, figs. 8-12 ; 

 pi. 10, figs. 1-5. 



1850. Anchorella uncinata Baird. (4) p. 337, pi. xxxv, fig. 9. 



1900. Anchorella uncinata T. Scott. (112) p. 177, pi. viii, figs. 43, 44. 



1906. Clavella uncinata Brian. (21) p. 110. 



1909. Anchorella uncinata May E. Bainbridge. (3) p. 57, pi. ii, figs. 

 43-46. 



Female. Cephalothorax moderately slender and 

 about as long* as the genital segment. Genital segment 

 ovate, slightly flattened, and moderately elongated, 



