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



lobed. Frontal border slightly concave. Lunulae very large, 

 the whole thickness of the plate. Anterior antennce having 

 the basal joints short and thick, with about fifteen plumose 

 setse on front border, with simple bristles near outer end ; 

 second joint dilated at end, with seven fine bristles. First 

 maxiUiped very slender ; no setas seen on second joint, as in 

 C. irritans. ISecond maxilliped having the end claw strong 

 but short, provided with a short bristle on concave border one 

 third from point. Furcula with narrow, pointed, slightly 

 spreading branches, from a wide base. Tlie terminal joint 

 of the first perseopod has three short bristles at the end, 

 decreasing in length from first to third; at the angle there is 

 a fine plumose hair and on under border three longer similar 

 ones with thickened bases. Fourth per^eopods are long, the 

 terminal joint provided with five moderately long, curved, 

 simple claws, the last three being close together. Genital 

 segment oblong, with the posterior angles slightly produced, 

 three fourths as long as the cephalothorax. Abdomen short, 

 half as long as the last segment, single-jointed, slightly con- 

 stricted anteriorly. Caudal plates rather longer than broad, 

 terminating in three moderately long plumose setge, and 

 having a shorter one on the outer border. 



Length 5 millim. 



The male has the cephalothorax much more elongated, the 

 genital segment is more pyriform, and the abdomen longer; 

 the hamulus anterior is also very long and sickle-shaped 

 (PI. III. fig. 4). 



Length 3 millim. 



Caligus longicaudus, sp. n. (PI. IV. figs. 1, 2.) 



This species was found in small numbers of either sex in 

 the gill-cavities of two fish in Bombay Harbour — TricMurus 

 havmela and Chirocentrxis dorab. It differs from G, pro- 

 ductiis, Dana, by the short genital segment, the absence of 

 the deep notch on the frontal plate, by its less sharply pointed 

 furcula, and in the detail of the first perseopods &c. ; from 

 G. trichiura, Kr., by the longer cephalothorax, larger and 

 deeper lunula, and different shape of the furcula. 



Female (PI. IV. fig. 1). — Cephalothorax almost a perfect 

 oval, with the posterior angles rounded, less than half the 

 total length. Frontal plate with slightly convex anterior 

 border; lunules large, extending the whole depth of the 

 plate. Anterior antennce having the basal joint short, not 

 quite so long as the diameter of the lunula j it is provided 

 on its anterior border with eight rather stout, short, plumose 



