1908] Decapod Urustaceans. 9 
1st and 2nd joints (coxa and basis) of the stem are closely united 
and diffieult to distinguish from each other. The 2nd joint is small 
and short, as is also the third (isehium). The 4th joint on the other 
hand (meros) is of considerable length, nearly twice as long as the 
three distal joints together. The 7th and last joint (dactylos) is 
united by an ineomplete artieulation to the preceding joint (propodos), 
is anteriorly rounded, and is furnished with a row of stiff setae (Cc, 
10) which even when slightly magnified (ce, 20) ean be seen to have 
fine spinules along the edges. 
SPENCE Bare when describing Paraxius altus does not eall this 
joint dactylos, since in the said species according to him dactylos 
is wanting in this pair of gnathopods. His view is that propodos 
im the first pair (i, e, 1st gnathopod = 2nd maxilliped) terminates 
the appendage as å semicircular terminal joint.” 
Stiff setae like those of the last joint are to be found also on 
the penultimate joint. All the joints of the stem are moreover fur- 
nished with long thinnish setae, which are most dense along the 
inside of the second and the outside of the fourth joints. 
Fjephysis consists of a pedunele and an almost equally long 
artieulated (11—12) lash, whose tip projects slightly beyond the 
second joint of the preceding stem. Of branchiae we find no less 
than three belonging to this pair of gnathopods (fig. 1, V): mastigo- 
branchia, similar to what we previously mentioned in the case of 
the first maxilliped, podobranchia closely attached, and finally 
arthrobranchia attached to the membrane beneath the coxa. 
The mastigobranchial lamella is shaped like å knife-blade, is 
slightly shorter than the pedunele of the ecphysis, and is consider- 
ably smaller than that on the 1st maxilliped, obtuse and setose on 
the inner edge, tapering at the end, and furnished with small hooked 
setae along the edges. 
The podobranchia is attached just at the junction between 
mastigobranchia and coxa, is shorter than the mastigobranchia, and 
has its edges divided into several small lobules. 
The arthrobranchia is of nearly the same length as the mastigo- 
branchia and has also its edges divided into small lobules. 
3rd Maxilliped (= 2nd gnathopod, fig. 2, V). The stem of 
this pair of maxillipeds consists, as in the preceding gnathopod, 
of seven joints: of which the first and second are pretty nearly 
indistinguishable. 
