480 ME. P. W. BASSETT-SMITH ON [Apr. 38, 



(2) CoLOBOMATUS BERGTLT^. $ . (Plate XXVI. figs. 5, 5a.) 



Colobomatus hergyltce Hesse, op. cit. 1873, pi. xxiv. fig. 8. 



C. Vogt, op. cit. 1877, p. 411. 

 Host : head of Labrus hergyltce [L. maculatus]. Brest. 



G. 5. Leposphilus Hesse. 



Female. Head small, rounded. Body elongated, segmented; 

 thorax of two indistinct joints followed by a large dilated genital 

 segment. Abdomen of six distinct articulations ; no lateral appen- 

 dages, but minute caudal setose plates. A single median eye, 

 proboscis and small maxillipeds present. 



Male very similar to that of PJiilichthys. 



Leposphilus label $ c? . (Plate XXVI. fig. 6.) 



Lej>os^hilus labrii Hesse, Ann. Sci. Nat. ser. 5, vol. v. 1866, 

 p. 265, pi. ix. 

 „ „ Hesse, op. cit. vol. xvii. art. 14, 1873. 



„ C. Vogt, op. cit. 1877, p. 387. 

 Host : lateral sinus of Labrus donovani. Brest. 



Family V. LEEN^ID^. 



The body in the young, sexually mature form very similar to 

 those of the preceding families. The anterior antennae are short, 

 slender, and carrying small bristles ; the posterior pair are uncinate, 

 generally projecting beyond the front border of the cephalothorax. 

 The maxillipeds are very small and weak. There are four pairs of 

 thoracic limbs well developed, the first two or more biramose. 

 Genital segment of female much elongated. Abdomen rudimen- 

 tary. Eye median. The larvae vary from a cy clops-like form to those 

 with a twdsted frontal filament. In the older and fixed parasitic 

 condition, the females are long, worm-hke, generally without limbs, 

 some with irregular excrescences from the anterior portion, others 

 with elongated appendages from the genital segment or abdomen. 

 Egg-sacs double. 



G. 1. Leen^oceea Blain villa. 



Head not distinctly divided off, but bearing horn-like processes. 

 Mouth terminal. Genital segment much elongated, slightly curved ; 

 the limbs placed at nearly equal distances one from another, the 

 first four pairs biramose, tri articulate, the fifth very minute. 



(1) Leen^oceea esochsta. $ . 



Lerncea cyprinacea Linn. Eauna Suecica, ii. 1761, pi. xi. fig. 2. 



„ „ Blainv. Journ. de Physique, xcv. 1822, p. 337. 



Lernmocera cyprinacea Burm. Nov. Act. Nat. Cur. xvii. p. 309, 

 pi. xiv. fig. 1 (1835). 

 „ „ Nordm. Mikrogr. Beitrage, ii. 1832, 



p. 123, pi. vi. fig. 1. 



