[fraser] COPEPODS PARASITIC ON FISH 63 



The first antennae are heavy and rounded, with no indication of 

 division into joints. The second antennae are strong, taper gradually, 

 regularly curved, with no abrupt curve near the tip. Mandible but 

 slightly curved, palp very small. The terminal joint of the maxilla 

 tapers gradually and is but slightly curved; the distal portion of the 

 convex margin is provided with four curved teeth ; there is a spine on 

 the distal end of the basal joint. The terminal joint of the maxilliped 

 is relatively stout; the terminal spine is straight; the end of the 

 joint beside it is rough with teeth but does not form a very distinct 

 knob. 



Total length 7-3 mm., length of céphalothorax 1-4, width 2-1, 

 greatest width of thorax 3-8, width of genital segment 0-7, length of 

 egg strings 11-0, width 1-3. 



Male: Body rather slender. Céphalothorax not inflated, much 

 longer and slightly deeper than broad. A slight indication of separa- 

 tion between head and first thoracic segment; the remaining three 

 segments free; the second and third much larger than the fourth. 

 Genital segment about the same length as the second thoracic but 

 scarcely any broader than the fourth. Abdomen small; anal lamina 

 conical, without spines or setae. 



The first antenna is two-jointed, the basal joint being the longer; 

 it has two short spines on the anterior surface; the terminal joint has 

 a spine near the base, one half way along, and five spines or stiff 

 bristles at the tip, one projecting forward and the others in the direc- 

 tion of the joint. The remaining appendages of the head are much 

 similar to those of the female. 



The two pairs of swimming legs are much similar except that the 

 first one is biramous and the second uniramous, but all the terminal 

 portions are very minute. 



Total length 0-74 mm., length of céphalothorax 0-46, width 0-26. 



Colour: Uniform yellowish. 



(irregularis, on account of general shape of female). 



Found on the gills of Enophrys bison. 



Chondracanthus palpifer, Wilson 

 Chondracanthus palpiper. Wilson, Contr. to Can. Biol., 1912, p. 93. 



Wilson did not give the host for this species. Specimens have 

 been obtained in the gill cavity of Gadiis macrocephalus. ^ S^\\i^^ ^A/ 



Sec. v. Sig. 5 "O* ^i^Q**.^ • 



