THE MISCHIEVOUS GRIBBLE 367 
that the mandibles have no ‘palp’ or only a one-jointed 
one. By the antennal joints projecting in front, the 
uropods extended behind, and the large side-plates of the 
perzeon radiating laterally and distally widened, the lead, 
the back of the pereeon, and the pleon are completely en- 
closed, and the outline becomes an unbroken oval. The 
animal, being only one-fifth of an inch long, might, like the 
still smaller Campecopea hirsuta, seem to be no fit subject for 
protective mimicry. It must be supposed that, minute as 
they are, they are found worth eating by creatures highly 
enough organised to be guided in their attacks by torm 
and colour. 
Family 6.—Inmnoriide. 
The body is sub-depressed ; the pleon has six distinct 
segments. ‘The eyes are lateral, wide apart; the antennz 
of both pairs are short, the first having a single-jointed 
flagellum ; the mandibles have a chisel-like cutting edge, 
the molar tubercle obsolete, the ‘palp’ small, three- (or 
perhaps sometimes two-) jointed; the first maxilla have 
two slender plates, the second have three; in the maxilli- 
peds the second joint is produced, the five joints of the 
‘palp’ are short, its three middle ones somewhat expanded; 
the epipod is elongate; all the limbs of the peraeon are 
similar, not prehensile, but with bifid fingers; the five 
pairs of branchial pleopods are sheltered in the vaulted 
pleon, all ciliated except the fifth pair, which is smaller 
than the rest; the second pair in the male have the usual 
stilets; the uropods have two single-jointed branches, 
koth movable, the outer much shorter than the inner. 
Inmnoria, Leach, 1814, is the only genus. The type, 
Iamnoria lignorum (J. Rathke, 1799), known at Plymouth 
as the Gribble, has an evil fame for gnawing submerged 
timber. It is widely distributed. Inaccuracies in the 
earlier descriptions of the species have been pointed out by 
the late Mr. Oscar Harger with his accustomed care and 
acuteness. In New Zealand Mr. C. Chilton has found a 
second species, Limnoria seqnis, on the roots of the sea- 
