444 
ZOOLOGY OF THE FAR EAST. 
minute, about one-fourh of the length of the first joint of the main flagellum and 
tipped by three setae. 
Second antenna (pi. XIX, fig. 14) shorter than the first, with its peduncle equal in 
length to that of the first, fifth joint slightly shorter than fourth, both with two or 
three fascicles of short setae on the lower margin, flagellum of about 30 joints. 
Month parts agreeing very closely with those of A . fontana, Sayce, except that 
there are only two triangular teeth on the distal margin of the inner plate of the 
maxillipedes. A. japonica agrees with A. fontana as against A. gabrieli, Sayce, in 
the less expanded form of the mandible palp and in having the inner lobe of the first 
maxilla furnished with 10 plumose setae. 
Second and third thoracic limbs (first and second gnathopods) (pi. XIX, figs. 15-16) 
subequal in .size and very similar in form, second joint with a few ver}'^ long setae on its 
margin, carpus shorter than the propodus, hardly if at all lobed, with a few fascicles 
of setae on the inner edge, propodus oblong, subquadrate, nearly twice as long as 
broad, palm slightly oblique with a fringe of short setae and four or five spines on 
the outer corner, inner margin of the propodus with four or five bunches of setae, 
outer margin with a bunch of setae at the distal end and two or three other fascicles, 
finger equal to the palm. Second joint of the last thoracic limbs (pi. XIX, fig. 18) 
broadly oval, front margin with a few spines, hind margin regularly and finely serrate 
and produced beyond the third joint. 
First uropods with the peduncles longer than the subequal rami. Peduncle 
with one spine on each of the upper distal corners. Inner ramus with two spines 
on the upper margin and two small and one large spine at the tip. Outer ramus 
with one spine on the upper margin and three at the tip. 
Second uropods extending back to the level of the first uropods, peduncle longer 
than the rami, with one spine on the upper margin and one at each upper distal 
corner. Inner ramus slightly longer than the outer, both with two spines on the 
upper margin and three at the apex. 
Third uropods (pi. XIX, fig. 19) outreaching the first and second by about half the 
length of their branches, peduncle shorter than the rami, with one spine on the inner 
margin and one at each upper distal corner. Rami equal in length, lanceolate, with 
5-6 spines on their inner margins and 3-4 spines on their outer margins, a plumose 
seta accompanying each spine. 
Telson (pi. XIX, fig. 19) at least as. long as the peduncle of the third uropods, 
cleft almost to the base, each lobe furnished with four long setae in a row at the apex 
and a single long seta anterior and lateral to the terminal setae. 
Length of both specimens, 7 mm. 
Remarks. — This species is, I think, without doubt, congeneric with A. gabrieli 
and A. fontana, Sayce. It agrees specially closely with the latter species and is dis- 
tinguished by the larger eyes of reniform shape, the relatively longer third uropods, 
the very many fewer spines on the first and second uropods, the armature of the 
telson, the form of the posterior margin of the third somite of the pleon, the less 
lobed form of the carpus of the gnathopods and the presence of only two triangular 
