EEPORT ON THE AMPIIIPODA. 975 



lobe of the hind margin ; the fourth segment with a slight transverse dorsal 

 depression. 



Eyes large, reniform, almost meeting at the top of the head, situated very near the 

 front margin, with numerous small ocelli; dark in spirit-preserved specimens. 



Upper Antennse. — -The first joint as long as the next two united, its length twice its 

 greatest breadth, with one or two apical teeth, and two or three apical groups of spines ; 

 the second much narrower than the first, more than twice as Ions as the third, with some 

 small groups of spines along the surface and on the bluntly toothed apex ; the third 

 joint armed in like manner ; to a not quite complete nageUum there were fifty- three 

 joints, the first broad, not quite so long as the third joint of the peduncle, showing within 

 it eleven very short joints in preparation ; almost every joint was armed with a calceolus 

 and setules, many had also cyliuders, these joints being distally more dilated than the 

 others, and occurring at first alternately, then at intervals of two, and towards the end 

 of two or three ; the secondary flagelrum consisting of a single slightly tapering joint, 

 almost as long as the first of the primary, tipped with four setules. 



Lower Antennse shorter than the upper; first three joints short, gland-cone closely 

 decurrent, third joint carrying some spines ; fourth joint a little longer than the fifth, 

 both carrying several groups of spines ; the fifth joint about equal in length to the first 

 of the upper antennas ; the flagellum thick at the base, with fifty-two or more short 

 joints, the calceoli small. 



Upper Lip so far as observed like that of Eusiroides cmsaris. 



Mandibles.- — These differ from those of the species just mentioned in the following 

 points ; the secondary plate on the left mandible has seven teeth, on the right mandible 

 is thin and straight, drawn out into four teeth at different levels, the principal plate 

 on this mandible being broad and massive ; the spine-row has nine spines on the left, 

 seven on the right, mandible ; the long third joint of the palp has a rather broader apex, 

 and besides the thick fringe of spines on the front margin, has near the centre of the 

 convex hind margin a single short spine or seta. 



Lower Lip as in Eusiroides csesaris. 



First Maxillse. — Inner plate long oval, having on the inner slope of the apex two 

 spines or short setae, of which the upper part is slightly feathered ; the outer plate 

 carrying ten spines as in the species just mentioned, but with the lateral denticles less 

 elongate, the innermost spine with many small denticles, the two outermost with but one 

 denticle apiece ; the first joint of the long and slender palp not more than half the length 

 of the second, with two long spines on its outer margin ; the outer margin of the second 

 joint straight, smooth, the apex with three slender spines, eleven more fringing the 

 oblique fine running from the apex to the straight part of the inner margin ; the spines 

 are in two rows, longer in the one than the other ; there is no seta on the outer margin 

 of the trunk in our specimen. 



