BOMOLOCHUS SOLE.E. o7 



but each segment is narrower than that which precedes 

 it ; the other thoracic segments small, and partly con- 

 cealed in dorsal view. Abdominal segments also 

 small. 



Antennules moderately short and stout, composed of 

 seven joints, and furnished with long plumose setae ; 

 the joints subequal in length but the fourth rather 

 longer than either the third or the fifth. Antennae 

 three-jointed, middle joint short, end joint provided 

 with three pectinated, setiferous appendages and a few 

 apical setse. Mandibles small, but moderately stout, 

 and armed with two small, oval, terminal plates serrated 

 on the edges. First maxillipeds small, each with a 

 stout, setiferous, terminal spine, from the side of which 

 springs a minute accessory spinule. Second maxil- 

 lipeds having the basal part considerably dilated, but 

 the distal portion slender, curved, and claw-like. The 

 first four pairs of thoracic legs with both the inner 

 and outer ramus three-jointed; in the first pair both 

 rami broadly lamelliform, somewhat distorted, and 

 furnished with densely plumose setae, the middle joint 

 rather shorter than the first or third. The second and 

 third pairs with both rami longer and much narrower 

 than those of the first pair, and furnished with densely 

 plumose setae on the inner margins and short stout 

 spines on the outer ; under the microscope these 

 spines are seen to end in minute hooks. The inner 

 ramus in the fourth pair narrower and rather longer 

 than the outer, and bearing a single plumose seta on 

 the inner distal angles of the first and second joints, 

 and also three apical setae, the middle one being 

 longer than the one on either side. Fifth pair con- 

 sisting each of a single two-jointed ramus, the first 

 joint being very short, the other of moderate length 

 and bearing one marginal and three terminal setae. 

 Caudal rami short. Length about 1*3 mm. 



Habitat. Found parasitic on the back of the common 

 sole, Solea vulgaris Quen., and in the nasal fossae 

 of various fishes, especially of cod-fishes : it has been 



