OONGERICOLA PALLIDA. 125 



Free thoracic segments two, very short, and without 

 lobes or dorsal plates. Genital segment elongated, 

 narrow, and subcylindrical. Abdomen short ; caudal 

 segments small and setiferous. 



Antennules short and composed of about six joints, 

 but one or two of the articulations are not very- 

 distinct; antennas two-jointed, and provided with 

 strong terminal hooked claws. Mouth-appendages 

 somewhat similar to those in Hatschekia. Thoracic 

 legs four pairs, biramose, and somewhat rudimentary. 

 Colour pale reddish, scarcely so deep-coloured as the 

 gills of the fish. Length, exclusive of egg-strings, 

 about 4 mm. ; egg-strings slender and elongated, about 

 twice as long as the animal. 



This species, in its general appearance, has a some- 

 what close resemblance to Hatschekia. 



The male has not been observed. 



Habitat. — Parasitic on the gills of conger eels, 

 ( 'onger vulgaris Cuv. (Conger niger, Risso). Plymouth 

 (Bassett- Smith). Firth of Clyde and at Aberdeen (T. 

 Scott). Lancashire coast (A. Scott). 



This parasite is not uncommon on the gills of large speci- 

 mens of the conger, and sometimes occurs in considerable 

 numbers. Thirty individuals have been taken from the gills 

 of a single fish. The species has been recorded from the 

 Adriatic (Dr. Graeffe) as well as from the coast of Belgium 

 (P. J. van Beneden). 



Genus 25. EUDACTYLINA P. J. van Beneden, 1853. 



Female. — Cephalothorax composed of five segments ; 

 cephalic segment obtuse, wider behind than in front ; 

 thoracic segments without dorsal plates or lateral 

 processes. Abdomen, including the genital segment, 

 considerably shorter than the cephalothorax and com- 

 posed of three segments. Antennules short, stout, 

 and usually five- jointed, basal joint usually provided 

 with strong hooked spines; antennas three-jointed and 

 armed with stout terminal claws. Mandibles and 



