110 DR. W. B. COLLINGE ON TWO 
spines, of which the outermost is the largest and has a short, stunted tooth- 
like body at its base ; on the inner side is a single needle-like spine ; densely 
setose on the outer margin ; inner lobe small, with two elongated setose 
spines terminally. Second maxillae thin and plate-like, setose terminally. 
Segments of the mesosonie strongly arched, the 1st with eleven jointed 
spines and the remainder with seven ; pleural plates, excepting those of the 
lat segment, produced into long spinous processes. Maxillipedes (fig. 19) 
somewhat robust ; outer lobe 3-jointed, with two straight spines on the 1st 
joint, four on tlie 2nd, and one small one on the outer border of the 3rd joint, 
which latter terminates as a blunt process surmounted by a number of setae ; 
inner lobe plate-like, with two small tooth-like spines and a single straight 
spine on the ventral face. Appendages of the mesosome (fig. 20) compara- 
tively short. Segments of the metasome crowded together, 3rd, 4th, and 5th 
each with two jointed spines in the mid-dorsal line ; pleural plates greatlj^ 
elongated, directed backward and terminating in a finely drawn out spine. 
Uropoda (fig. 24) extending beyond the telson, basal plate oval-shaped, with 
a single appendage (exopodite) which terminates in a strong curved spine. 
Telson (fig. 25) somewhat triangular in shape, terminally obtusely pointed, 
with two 3-jointed spines and a small median papilla in front of these. 
Length 10 mm. 
Colour (in alcohol) creamy white with dark chocolate-coloured markings. 
Younger forms creamy wiiite. 
Hah. Forest of Folohy, East Madagascar, 1911 {Herschell cjj- Cliaitvhi) ; 
Analamazotra, Eastern Forest, June 1911. • Under rotten logs [P. A. 
Metlmeii). The specimens from the latter locality are evidently immature. 
a. General Form. — This is undoubtedly one of the most handsome and 
peculiar Terrestrial Isopods known, rivalling in both form and colour any 
species hitherto described. The long-jointed spines covering the mesosome 
and metasome and the drawn-out spinous pleural plates give the animal the 
appearance of some Coleopterous larva rather than a Crustacean. 
There is, I think, little doubt but that the members of this genus are 
capable of rolling themselves up into a ball like the Armadillidiidae. Apart 
from the fact that one specimen was found (in alcohol) so rolled up, the 
extreme mobility of the segments support such a view. 
The remarkable jointed spines on the body would seem to be a hitherto 
undescribed character in the Isopoda. I have been unable to find any 
reference to such in the literature on these Crustaceans. So tar as I can 
make out from the material available, the spines first appear as small excres- 
cences on the surface of the segments (fig. 23, a) ; these increase in size and 
later appear as ordinary spinous processes (fig. 23, h); a little later they con- 
tinue to grow, a distinct joint forming at the base of the first period of 
growth (fig. 23, c), and this continues until, with the exception of those 
