158 
i nation. Each lobe is somewhat oblong in shape with the distal 
angles rounded off and densely fringed with setae, all more or less 
directed inwards towards the median line. 
Th q first maxilla (Plate xxiii,, fig. 7) consists of two parts, the 
outer part is longer and broader than the inner, its total length is 
nearly four times the greatest breadth, the outer edge is curved so 
that the distal half is directed somewhat inwards to the median line. 
On the end it bears about 10 to 12 short stout spiniform seta^ 
arranged mainly in two rows, the outer setae are the largest, the 
others decreasing in size inwards, some of the smaller are minutely 
denticulated on the inner side near the middle. Both the inner 
and outer margins of the outer portion of the maxilla bear a 
number of very tine hairs, and near the inner distal angle one or 
two delicately plumose seta; arise a little below the base of the 
spiniform teeth. 
The inner portion of the maxilla is only about half as long as 
the outer, and it is also narrower. Tt curves somewhat inwards 
and bears fine hairs on both margins. The extremity bears four 
or five large seta 1 somewhat distant from one another, each being 
densely but finely plumose in the distal half. In addition to these 
there are also two simple setm at the base of the plumose setse, 
one at the outer distal angle, and the other at the centre of the 
surface of the joint. 
In describing the first maxilla of lanthe speciosa, Bovallius 
speaks of the two portions similar to those just described, as the 
exopodite and endopodite respectively.* The appendage is un- 
doubtedly difficult of interpretation, but from Boas’s comparative 
researches it appears more probable that these two portions repre- 
sent the internal and external lacinw arising from the basos and 
ischios respectively, the remainder of the typical limb being lost.f 
The second maxilla (Plate xxiv.,fig. 1) consists of a basal portion 
prolonged at its inner distal angle into a long rounded lobe, and 
two lobes external to this articulating with the basal portion. 
The inner margin of the base is very slightly concave, and is sup- 
plied throughout its whole length with a thick fringe of long seta 1 , 
these seta are arranged in a distinct line which, at the end leaves 
the margin and is continued fora short distance along the surface 
of the inner fixed lobe. The rounded end of the lobe is also fringed 
with seta, the innermost of which are pectinated, while those in 
the row along the inner margin are simple. 
The two articulated lobes are of about the same size, sub-oblong 
in outline, curving slightly inwards and with the ends obliquely 
* " Ianthe, anew genus of Isopodat,” Bihang. Till. K. Svenska Vet. 
Akad. Handlingar. Band 6, No. 4, p. 7. 
f See Parker — <f The skeleton of the New Zealand Crayfishes.^ (Studies 
in Biology for New Zealand Students, No. 4) p. 21 ; also Boas — ff Studien 
iibcr die Vcrwandtsehaftsheziehungen der Malukostraken.” 
