68 G. M. Giles— Descriptions of new Indian Ampliipods. [No. 1, 



basipodites much enlarged, especially the latter. Their meropodites 

 are short and their dactylopodites remarkably long and slender, the 

 seventh, which is the longer, is subequal in length to the fourth. The 

 eighth is peculiar in having its posterior border provided with a 

 flat plate which reaches considerably below the articulation with the 

 ischiopodite ; the ischio- mero- and carpopodites are subequal, the pro- 

 podite comparatively long and slender, and the dactylopodite minute. 



The first three abdominal appendages are of the usual type, and the 

 last three equally biramous and of progressively smaller size, the sixth 

 being proportionally smaller than in nearly any member of the genus, 

 except A. propingua, Boeck., which differs, however, in a number of other 

 points. 



Lysianassa wood-masoni, n. sp., PL II, Fig. 4. 



This species was dredged from a coral sand bottom in 17 fathoms 

 in Macpherson's Strait, Andaman Islands. 



The animal is 8 mm. long, semitransparent, and colourless, with 

 the exception of the eye, which is of a deep purple tint. 



The head is small, having, in profile, an irregularly pentagonal out- 

 line. The large compound eye occupies the greater part of its anterior 

 half, and the border articulating with the antennule is marked by two 

 notches with a tubercle between them. 



The thorax forms rather more than half the entire body length, its 

 segments increasing regularly in dimensions from before backwards. 

 All the coxal plates are deep, the fourth, however, markedly exceed- 

 ing the others. The lower borders of the last three present a notch for 

 the articulation of their corresponding basipodite. 



The first three abdominal segments are large and subequal ; the 

 fourth, nearly as long, but much less in depth ; and the last two very 

 email. 



The telson is laminar and notched. 



The antennule is as long as the first four thoracic appendages. 

 Its peduncle forms but a third of its length, the first joint being large 

 and having its lower border produced distally into a sort of process, 

 while the last two are extremely short. There is a very minute appen- 

 dage consisting of four articuli. The first joint of the flagellum is 

 much larger than those that succeed it, approaching the first joint 

 of the peduncle in length. It bears on its lower border a brush of long 

 silky hairs. 



The antenna is as long as the thorax : its peduncle forms but one- 

 fourth of its length, and consists of two subequal, very short basal, 

 and three, also subequal, somewhat longer, distal joints. The flagellum 

 is made up of a large number of short articuli. 



