new Parasitic Copepods on Fish. 359 



Beluchistan, and often on Garanx djedaba, Aden. The species 

 is well defined and easily recognized. 

 Length 1 millim. Transparent. 



Body distinctly segmented ; the cephalothorax elongate, 

 forming a solid carapace, followed by two free short thoracic 

 segments and a large oval genital segment ; the caudal portion 

 is Inarticulate, the first joint is almost square, the second 

 elongated and tapering, carrying at its extremity two rather 

 large caudal plates, each of these terminating in a very long- 

 strong simple bristle, having a minute hair at its base, and 

 also a small one at the base of the caudal plate. 



Anterior antenna? long, elegant, five-jointed, the first being 

 short, carrying a long plumose hair on its under border ; the 

 second joint is very long, cylindrical, and tapering, bearing 

 along its front border about twelve fine ciliated hairs and one 

 long plumose hair near its termination ; the third joint is 

 about half the length of the last, with three plumose hairs 

 near the end, one being extremely long ; the fourth of much 

 the same size, with two terminal plumose hairs ; the last 

 joint is half as long again as the fourth, terminating in six 

 plumose hairs. 



Posterior antennoz spring from close under the first ; they 

 are three-jointed, and resemble much the same organs in the 

 female. 



Second maxilliped is distinctly three-jointed, being very 

 large and powerful ; the basal joint is oval and muscular, the 

 second broad and flattened, the surface being minutely 

 granular, its front edge having a fine tooth about halfway 

 down; the terminal joint is in the form of a long slender 

 claw, with the concave edge minutely toothed; near the base 

 of this and on the opposing joint one sees a fine bristle. 



First, second, and third true limbs biramose, each branch 

 three-jointed, the outer branch of the third bearing dentate 

 spurs as in the female, all the others provided with ciliated 

 hairs. Fifth pair uniramose, the terminal joint having its 

 border fringed with fine hairs and terminating in three short 

 thick ones. 



Caligidse. 



Caligus, Muller. 



Caligus longipedis, sp. n. (PI. X. figs. 2, 3.) 



This species was taken from the skin-surface of a Garanx 

 tnelampkigus at Aden ; both the male and the female were 

 obtained. In the gills of the same fish were present, espe- 

 cially in the neighbourhood of the gland, numbers of G. tenix, 



25* 



