10 
W. M. TATTERSALL. 
half of the exterior margin ; a bunch of coupling setae on the inner distal corner ; 
second joint slightly longer than the third and without a lobe, its anterior margin 
a little oblique. 
Antennal peduncle about equal in length to the basal two joints of the antennular 
peduncle, the third joint only very slightly shorter than the second. 
Antennal scale reaching the centre of the third joint of the antennular peduncle, 
about three times as long as broad, outer margin entire and terminating in a spine, 
apex broadly rounded ; spine on the outer corner of the basal joint long and slender, 
extending one-third of the way along the scale, plumose at least on the 
proximal part. 
The mouth parts (Plate II., Figs. 3, 4, 5) are figured for comparison with those 
of other species. They do not appear to present any striking peculiarities. 
Fi rst thoracic limb (Plate II., Fig. 6), has the penultimate joint of the endopocl 
longer than either the preceding or ultimate joints ; the latter has the lower margin 
armed with a row of short fine setae in addition to the longer ones at the apex. 
Second thoracic limb (Plate II., Fig. 7), with the terminal joint armed with a row of 
three (sometimes four) short, rather stout and curved spines on the inner face. 
The remaining thoracic limbs have the penultimate joint in all cases longer than 
the ultimate and slightly longer than the antepenultimate. The following table 
gives the lengths of the joints of the first six thoracic limbs in millimetres and the 
total length of the limbs from a specimen 27 mm. long. 
Lengths of the joints in mm. 
Thoracic I _:_ j Total length 
limb. 
1 
2 
3 
4 
5 
6 
of limb in mm. 
1 
• 50 
1-11 
1 • 50 
' 77 
1-00 
•66 
5 • 54 
2 
• 50 
1-22 
1-77 
1-11 
1-22 
•50 
6-32 
9 
r> 
• G6 
1-50 
1-88 
1-22 
00 
CM 
r—i 
•72 
7-26 
4 
•66 
1-83 
2-05 
1-28 
1-33 
• 83 
7-98 
5 
•61 
2-00 
2-11 
1-00 
1-05 
•66 
7-43 
G 
• 55 
2 • 00 
2 • 00 
•72 
•83 
•44 
6-54 
First pleopod of the male (Plate IV., Fig. 10) with both movable processes on the 
inner plate of the endopod shorter than the plate itself; distal process feebly curved, 
bifid at the tip ; proximal process expanded at the tip into two lobes not in the 
same plane, the outer lobe the larger, and wider than long, the inner lobe but little 
expanded ; uncinus of the inner plate of the endopod without secondary spinule. 
Telson about one and a half times as long as the last segment of the pleon ; 
apex acutely pointed ; sub-apical spines extending for half their length beyond the 
