EEPORT ON THE AMPHIPODA. 783 



palp, the plates of the first maxillas, the small inner plates of the maxillipeds, but on the 

 other hand the palp of the first maxillaj is one-jointed, and the outer plates of the 

 maxillipeds, though small, are not rudimentary. The telson is undivided as in Leucothoe, 

 but the third uropods are uniramous as in the Stenothoinse. In the gnathopods of Seba 

 it is not the wrist, as in Leucothoe, but the hand which sends out the chela-forming 

 process. In the British Museum Catalogue, Spence Bate places Pardalisca immediately 

 before Seba, and Leucothoe before Pardalisca. Thomson and Chilton in their New 

 Zealand Catalogue place Seha immediately after Leucothoe. Gerstaecker, with a note of 

 interrogation prefixed, makes Seha a synonym of Leucothoe, but in the definition of the 

 latter genus he describes the wrist of the gnathopods as " stark fingerformig ausgezogen," 

 both this character and the account given of the uropods precluding the union of the two 

 genera which he suggests. Boeck's definition of the Leucothoinse would require to be 

 considerably modified for the inclusion of Seha, which for the present I am content to 

 place rather on the confines of the family Leucothoidae (Sars) than within it. 



Seha saundersii, Stebbing, 1875 (PI. XLIX.). 



1875. Seba Saundersii, Stebbing, Anu. and ilag. Nat. Hist., ser. 4, vol. .xv. p. 2, pi. xv. figs. 



2, 2«-2c. 

 1884. Teraticum ti/picum, Cliilton, Trans. New Zealand Inst., vol. xvi. p. 257, pi. xviii. figs. 



1, 1"-1/. 

 ? 1885. Seha typica, Chilton, New Zealand Jourii. Sci., vol. ii. p. 320. 

 1886. „ ,, Thomson and Chilton, Tian.s. New Zealand Inst., vol. xviii. p. 148. 



The latei'al lobes of the head narrow, not very prominent, the first two segments of 

 the pleon postero-laterally almost right-angled, the hind margin of the second segment 

 faintly serrate upwards, the third segment with the postero-lateral angles somewhat 

 produced, rounded. 



Eyes not observed. 



Upper Antennw. — The first joint shorter but broader than the second, the third 

 scarcely half the length of the second, the flagellum of five joints, together equal to the 

 second joint of the peduncle, the first equal to the third joint of the peduncle, the fii'st 

 four armed with cylinders ; the accessory fiagellum not quite so long as the first 

 joint of the primary, its first joint narrow and tapering, its second rudimentary, 

 cylindrical, tipped with two setules. 



Lower Antennae rather shorter than the upper. The first joint a little dilated, the 

 second as long as the third, with the gland-cone inconspicuous ; the fourth joint longer 

 than the three preceding joints united ; the fifth shorter and narrower than the fourth, 

 tapering slightly ; the fiagellum of three joints tipped with setules, the first joint 

 longer than the second, and the second than the third, the three toojether shorter than 

 the fifth joint of the peduncle. 



