12 Mr. P. W. Bassett-Smith on some 



Genus Lernanthropus, Nordm. 



Lernantkropus trtfoltatus, sp. n. (PI. VII. fig. 3.) 



This species was taken from the gills of Polynemus tetra- 

 dactylus in Bombaj, but was rave ; four were taken from one 

 fishj two on either side, all being mature females. Wlien 

 taken from the body they were distended with sanguineous 

 fluid (PI. VII. fig. 3). 



Female. — Head oblong, with rounded angles, strongly 

 notched in front, folding inwards on under surface. Dorsal 

 scutes bipartite, anterior segment pyriform, constricted at the 

 neck. Posterior scute much dilated and rounded, from under 

 which project the fourth pair of foliaceous pera^opods. Ante- 

 rior antennce six-jointed, setiferous ; posterior two-jointed, 

 terminating in a strong simple claw. Feet of third pair in the 

 form of strong lamellar plates directed outwards, curved, 

 folding on themselves like a leaf, projecting slightly beyond 

 first dorsal scute. Fourth pair in the form of elongate 

 lamellar processes, two of which project considerably beyond 

 the posterior margin of the second scute; the third is more 

 acuminate, shorter, and placed beneath the other two. 

 Abdominal segment longer than broad. Caudal plates of 

 moderate size, simple, lancinate. 



Length 8 millim. 



The six-jointed anterior antennge, elongated plates of fourth 

 perseopods, which consist of three processes, and short genital 

 segment differentiate this species. 



Family Lernseoidea. 



Genus Lern^onema, M.-Edw. 



Lernceonema 2^oJynemi, sp. n. (PI. VII. tig. 1.) 



This species was found very frequently, of all sizes, one or 

 more being almost always present on well-grown specimens 

 of Polynemus tetradactylus taken in Bombay; and they must 

 be a great pest to this fish. Often as many as a dozen were 

 found on one, the head and neck deeply buried into the flesh ; 

 the body was full of blood, and yet the host appeared always 

 well nourished. The favourite sites were : — (1) at the base 

 of the caudal (I have traced the neck in on one side, and 

 passing between the vertebree found the head near the surface 

 on the other) ; (2) behind the dorsal fin ; (3) just behind and 



