new Parasitic Copepods on Fish. 7 



Female. — Cephalothorax oval, nearly twice as long as 

 broad, about one tliird of the total length. Frontal plate 

 slightly concave in front ; lunul^e shallow, but of considerable 

 diameter. Anterior anfennce having the basal joint slightly 

 longer than the width of the lunula ; setse markedly plumose, 

 the outer being strongest ; second joint club-shape, about 

 seven short bristles at the end. Posterior antennce in the 

 form of a long, much curved hook ; spur at the base sharp. 

 Hamulus very small and short. Palp at the base of first 

 maxilHped long and sharp. Second maxilUped with the 

 terminal joint in the shape of a long recurved simple claw. 

 Fwcnla small, with straight-edged but slightly spreading 

 branches. There are three very short simple setae on the last 

 joint of first pereeopod, with only three longer plumose ones 

 on posterior border ; the second joint has the edge fringed 

 with fine hairs. Hamulus posterior on third perteopod small 

 and curved. Fourth peraopod : first joint strong, the terminal 

 joint consists of three parts welded togetlier, forming a blunted 

 extremity, the last having on its inner border three short, 

 thickened, slightly curved simple sette, the first with its inner 

 border crenate, the next joint bears a fourth close to these, 

 and at the base of each is a rosette-like bunch of fine hairs 

 of a dark colour. 



Genital segment is much wider posteriorly and is deeply 

 lobed. The abdomen is as long as the cephalothorax, having 

 this dilated to an equal width with the last joint, being of a 

 dull semitransparent appearance. Caudal plates longer than 

 broad, bearing three terminal plumose bristles, the centre one 

 being much the longest ; there is also a shorter one on the 

 outer border. 



Length 7 millim. 



Male has an oval genital segment, the abdomen divided 

 into a short and following elongated portion, with caudal 

 plates much longer than in female (PI. III. fig. 2). 



Caligus Phipsoni^ sp. n. (PI. III. figs. 3, 4.) 



This species was found free on the inner surface of the gills 

 of Gyhium guttatum at Bombay ; only a few specimens of 

 both male and female were taken. In general form it 

 resembles C. irritans, Heller, but differs in having the 

 cephalothorax rather broader, the furcula larger, the abdomen 

 single-jointed, and in the arrangement of the bristles on the 

 caudal plates (PI. III. fig. 3). 



Female. — Cephalothorax longer than broad, slightly nar- 

 rowed anteriorly, rounded at the angles posteriorly, slightly 



