new Parasitic Copepods on Fish. 91 



giving off four plumose hairs, the second from the inside 

 being very long, always projecting beyond the border. These 

 caudal plates are sometimes quite hidden, at others they are 

 just visible beyond the border ; between them are two small 

 bilobed tubercles, divided from one another by the extremity 

 of the alimentary tube. 



Egg-sacs as in Cali</us } often long. 



Length 3 millini. 



Dichelesthiina. 



Lernanthhopus, Nordm. 



Lernanthropus atrox, Hell. (PI. VI. fig. 3.) 



At Bunder Abbas, in the Persian Gulf, attached to the gills 

 of Chrysophorijs sarba, a large number of specimens, both 

 male and female, of a Lernanthropus were taken, the female 

 so closely resembling L. atrox described by Heller, taken 

 from a " Paqrus " in Australian waters, that I have felt 

 justified in coming to the conclusion that they are the same, 

 though in the one described by him the anterior antenna? are 

 stated to be two-jointed only, which, though it may be pre- 

 sumptuous to say, as I have done in my last paper *, is 

 probably due to an error of observation on his part, as in- 

 variably in my experience, and from descriptions and plates of 

 Kroyer and Beneden, the anterior antenna} have at least six 

 joints — a generic guide. As the unnecessary multiplication 

 of species is to be deplored, I have referred my specimens to 

 this species, giving here a representation of the animal as 

 seen from the back and side, also a more enlarged drawing of 

 the antennae, as well as of the newly found male. 



Female. — Anterior antennce seven-jointed, the fourth joint 

 being the longest, bearing a small lobe-like process from the 

 lower border, the joints decreasing in size to the last, which 

 carries a bundle of fine hairs. 



Posterior antenna? with a long muscular basal joint and a 

 strong terminal hook. 



Length 4 millim. 



Male. — Caput oblong in shape, cut off squarely in front ; 

 side margins infolding equally, about one third the length of 

 the whole excluding the caudal processes. 



Anterior antennce seven-jointed, as in the female. 



Posterior antennas with very strong, curved, grasping- 

 hooks, which project far beyond the cephalic border. 



Rostrum pointed, but short ; on either side are seen the 



* Ann. & Mag. Nat. Hist., Jan. 1898, p. 2. 



