neio Parasitic Copepods on Fish. 9 



setse, the ones nearest the lunulce being the largest ', at the 

 end are three strong bristles, equalling in length the second 

 joint, which terminates in three or four long bristles and 

 several short ones. Posterior antennce three-jointed, the last 

 in the form of a strong hook, the basal joint carrying a sharp 

 pointed process. Hamulus very small and blunt. First 

 maxiUiped having a long pointed palp at the base ; terminating 

 in a bifid claw at the end, not very long. Second maxiUiped 

 with a stout basal joint, having a small spur at the base; 

 terminal hook shorter tlian the basal joint. Furcula witli a 

 wide elongated base, giving off from a narrow neck two flat- 

 tened, blunt, almost straight, simple branches. First peraso- 

 pods three-jointed; there is a small short spur at the outer 

 end of the anterior border of the second joint ; the third is 

 short and carries three short terminal bristles, the posterior 

 border being provided with thiee long finely phimose seta3. 

 The second perteopod has the terminal joint of the outer 

 branch furnished with eight long plumose setge, the anterior 

 border with three short simple bristles, the first joint bearing 

 two long chitinous spines. Third perteopod shows a very 

 small straight hamulus posterior. Fourth peraopod is strong, 

 terminating with four long, slightly curved claws placed close 

 together, and a fifth about halfway up the inner border. 

 Genital segment broader than long, posterior angle lobed, 

 bearing a rudimentary fifth limb, furnished with three plumose 

 hairs. Abdomen indistinctly two-jointed, almost as long as 

 the cephalothorax. Caudal plate longer than broad, with 

 three long terminal plumose set^e and two shorter ones on the 

 outer side, also one on the inner border. 



The male (PI. IV. fig. 2) has a more elongated genital 

 segment, a more distinctly two-jointed abdomen, the second 

 maxiUiped is very strong, the claw being provided with a 

 small bristle near its lower third ; and on its basal joint, front 

 border, are one single and three bifid tubercles. 



Caligus {Scicenophilus, Van Ben.) Benedeni, sp. n. 

 (PI. IV. fig. 3.) 



This species I have only taken once — a female, from 

 Sciccnia diacantlius, at Bombay. 



Cephalothorax one fifth of the wliole length and much less 

 broad than the genital segment ; it is almost circuhir in shape, 

 bearing fairly strong frontal lobes with a straight border; 

 the lunula are very small. Basal joints of anterior antennce 

 provided along the anterior border with about twelve very 

 tine plumose setai, the second having at its thickened end two 



