REV. T. Rk. R. STEBBING—CRUSTACEA ISOPODA AND -TANAIDACKEA. 225 
small point which seems to offer a problem hitherto unconsidered. If the 
first gnathopods of the male in Hansen’s Stenetrium antillense and in the new 
species of Janira here described are compared, the illustrative drawings 
show a remarkable similarity of the distal joints. But these joints, forming 
in each ease the subchela or grasping arrangement, are reckoned as hand and 
finger in the Stenetrium, but as wrist, hand, and finger in the Jamra. In 
other words, the dilated joint is preceded by five others in the former case, 
but by only four in the latter. The result is that in the Stenetrium the 
enathopod has for its seventh joint a large normally claw-like finger ending 
ina minute nail, but in the Janira the minute nail is supposed to be the 
finger, and the claw-like joint is regarded as the sixth joint or hand. Now, 
in the Asellidze the fifth joint or wrist of the first gnathopod is reduced to 
very small proportions, and it becomes a question whether in Janira the 
process may have been carried further, and the fifth joint either have been 
squeezed out altogether or have become undistinguishably coalesced with the 
sixth joint. While I think this not improbable, it is right to point out that 
in Janira minuta, Richardson, and in Janira nana, Stebbing, as well as in 
Janra maculosa, Leach, the supposed finger is not quite so insignificant as in 
the two species above compared, but has a shape and armature similar to that 
of the undoubted fingers in the following limbs. 
JANIRA CROSSLANDI, sp. n. (Plate 22, A.) 
Though the collection contained three specimens, two males and a female, 
the uropods were missing from all, nor was a clear view obtained of the 
frontal outline of the head. The pleon, about as broad as long, has the 
margins very faintly serrulate. 
The slightly prominent eyes are about twice as long as wide, with 
the inner margin concave. 
The first antennez have the first joint longer than broad, as long as the 
two following joints combined, the whole peduncle being two-thirds as long 
as the eight-jointed flagellum, in which the first and third are notably shorter 
than the joints which respectively follow them. The second antennz have 
the first four joints as usual short, with a very small exopod on the third 
joint, about twice as long as broad, and tipped with two setules ; the fifth and 
sixth joints are subequal, each a little longer than the first four joints 
combined ; the flagellum, somewhat longer than the peduncle, was composed 
of fifty-four very short joints, this and the last two joints of the peduncle 
being present only on the left side of the smaller male specimen ; so easily 
detachable is this part, that after examination it was lost in the anxious 
endeavour to keep it safe. 
The mouth-organs appear to agree closely with those figured by Sars for 
Janira maculosa, Leach. The mandibles are contented with four spines in 
the spine-row. The narrow inner plate of the second maxillze is tipped with 
