6 Mr. P. W. Bassett-Smitli on some 



Caligus ci/hii\ sp. n. (PI. II. fig. 3.) 



This species was found in the gill-cavity of Cyhium lineola- 

 turn at J^ombay. Only one s])ecimen, a female. 



Ccphalothorax longer than broad, contracted in front. 

 Frontal plates bearing small lunula3. Anterior antennce v{\t\\ 

 basal joint short and stout, terminal club-shape. Posterior 

 antenncc with strong recurved hook. Ilamnlus short, with 

 broad base. Palp at the base of first maxilliped long and 

 thin. Second maxilliped provided with a narrow, slightly 

 curved claw, nearly as long as basal joint. Furcula rather 

 large, with slightly curved, simple, divergent branches. 

 First percropod having the extremity of the terminal joint 

 provided with three rather strong short bristles, the anterior 

 being the shortest ; at the angle a fine plumose hair, with 

 three rather long plumose ones on posterior border. Second 

 perjBopods carry on the outer border of the joint's outer branch 

 two slightly curved chitinous hooks; the hamulus posterior on 

 the third peiasojiod being shorter and thicker. Fourth perteo- 

 pod has the terminal joint provided with three long, fine, 

 curved, simple set£e, with a minute spur at the angle, the 

 penultimate and postpenultimate portions also bearing simple 

 curved seta3, the last four are in close jiroximity. Genital 

 segment almost oblong, with slightly lobed and rounded 

 posterior angles. Abdomen half length of ccphalothorax, 

 nearly four times as long as broad, indistinctly two-jointed, 

 the last joint being as long as broad. Caudal plates equalling 

 in length last joint of abdomen ; they carry three short plumose 

 bristles at the extremity and a shorter one on the outer border. 



Total length 5 millim. 



This species differs from C. pelamydis^ Kr., in its longer 

 ccphalothorax, shorter abdomen, and structure of the furcula 

 and fourth peraopods. 



Caligus Itirautus, sp. n. (PI. III. figs. 1,2.) 



This species was very commonly found in the gill-cavity 

 of rolyntinus tetradacti/lns at l^ombay. It was extraordinary 

 on account of the ] eculiar dilated condition of the abdominal 

 segment, which I at first took to be an abnormality ; but as 

 it was apparently universally present in tiie females, it must 

 be taken as the normal condition. Also the rosette-like 

 bunches of hairs at the base of each of the thickened setie of 

 the fourth jicrieopods were quite unique; thougii very distinct 

 in the fresh specimens, these hairs were exceedingly difficult to 

 detect in mounted ones, except when in glycerine (PI. Ill 

 fig. 1). 



