480 ME. P, W. BASSETT-SMITH ON [Apr. 18, 



(2) COLOBOMATUS BERGTLTjE. $ . (Plate XXVI. figS. 5, 5«.) 



Colobomatus hergylto} Hesse, op. cit. 1873, pi. xxiv. fig. 8. 



C. Vogt, op. oit. 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 bj- 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 Philichthys. 



Leposphilus label 2 6 . (Plate XXVI. fig. 6.) 



Lejposphilus 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 tlonovani. 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 pan- are uncinate, 

 generally projecting beyond the front border of the cephalotborax. 

 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 cyclops-Iike form to those 

 with a twisted frontal filament. In tlie older and fixed parasitic 

 condition, the females are long, worm-like, 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 Blainville. 



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, triarticulate, the fifth very minute. 



(1) Lben^oceea esocina. 2 . 



Lerncea cyjjrinacea Linn. Pauna Suecica, ii. 1761, pi. xi. fig. 2. 



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



Lernceocera cypnnacea Burm. Xov. Act. Nat. Cur. xvii. p. 309, 



pi. xiv. fig. 1 (1835). 

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



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



