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



lobed. Frontal border slightly concave. Lunulge very large, 

 the whole thickness of the plate. Anterior antennce having 

 the basal joints short and thick^ with about fifteen plumose 

 seta3 on front border, with simple bristles near outer end ; 

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

 maxilliped very slender ; no seta3 seen on second joint, as in 

 C. irritans. iSecond maxilUjJcd having the end claw strong 

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

 third from point. Furcida with narrow, pointed, slightly 

 spreading brandies, from a wide base. The terminal joint 

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

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

 a fine jjlumosc hair and on under border three longer similar 

 ones with thickened bases. Fourth pera^opods are long, the 

 terminal joint provided with five moderately long, curved, 

 simple claws, tlie last three being close together. Genital 

 secjineut oblong, with the posterior angles slightly produced, 

 three fourths as long as the cephalothorax. Abdomen short, 

 Iialf 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 

 liaving 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. HI. fig. 4). 



Length 3 millim. 



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



This species was found in sinall numbers of either sex in 

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

 haximela and Chirocentrns dorab. It differs from G. pro- 

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

 the deep notch on the frontal ])late, by its less sharply pointed 

 furcula, and in tlie detail of the first ])era.xipods &c. ; from 

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

 dee])er lunula^, and diflferent shajjc of the furcula. 



Female (PI. lY. 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 antenna' liaving the basal joint short, not 

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

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



