NEW TEKRESTRIAL ISOPODS FROM MADAGASCAR. Ill 
on the cephalon and telson, where the spines are 3-jointecl, they become 
4-jointed, the longest measuring 6-5 mm. (fig. 21). All the spines are 
covered with minute scales like the rest oE the bo;ly (fig. 22). There are 
seven spines on the cephalon, eleven on the first mesosomatic segment, seven 
on the second to seventh segments, and two on each of the last three meta- 
somatic segments and the telson. 
b. The Cephalon. — This is extremely narrow from before backwards and 
slightly convex. Anteriorly thei-e is a well-marked marginal ridge which 
laterally develops into the two lateral lobes, and in the middle into the 
median lobe. Posteriorly the margin is deeply excavate, and from the middle 
line a strong spine arises ; lateral to this there are a pair of spines on each 
side, and a single one on each side, slightly nearer the centre, in front of the 
former. All of these spines are 3-jointod. The epistome is slightlj' convex 
dorsally and distinctly so ventrally, whilst laterally the sockets for the 
articulation of the antennae stand out as conspicuous bodies. 
1. The Eyes are placed dorso-hiterally ; they are of medium size and with 
few but large facets. 
2. The Antennulce (fig. IG) are small, and consist of an elongated basal 
joint, a tiny ring-like middle joint, and a gradually tapering terminal one. 
At the distal end of the third ioint and on the inner side are two blunt 
papillae. 
3. lite Antennce (fig. 17) are greatly elongated. The first joint is small, 
and the second about two and a half times as long, the third is still longer 
and narrower, whilst the fourth and fifth are almost coequal and nearl}' as 
long as the second and third together. All the segments are covered with 
minute setse. The flagellum is 2-jointed, the distal joint being rather longer 
than the proximal one, and terminates in a bunch of elongate setse. 
4. Oral Appendages (figs. 18 & 19). — These afford very little assistance in 
placing this genus and species. The 2nd maxillae and the maxillipedes are 
of the usual type. The 1st maxillae in the form of the first tooth of the outer 
lobe differs somewhat from any other genus. 
c. The Mesosome. — The segments of the mesosome are strongly arched. 
There are eleven jointed spines on- the first segment and seven on the 
remainder. 
1. The Pleural Plates oi the first segment are broad plate-like bodies with 
rounded anterior and posterior angles ; anteriorly they bound the postero- 
lateral half of the cephalon. Those of segments 2-4 are somewhat triangular 
in shape, the apex of the triangle being drawn out in a fine curved spine ; 
the whole of the plate is curved, the free spinous end bending upward. On 
segments 5-7 the plates terminate more abruptly before the commencement 
of the spine, and they are rather flatter. 
