Munna neo-zelanica, Chilton, MS.

Male.—Body narrow-elliptical, length about two and a half times the greatest breadth. Head not broader than first segment of pereion, deeply notched on each side for the bases of the antennæ; front margin straight, with rounded upper lip attached; the lateral portion behind the insertion of the antennæ has the anterior angle somewhat acute, the posterior angle rounded and slightly produced and bearing the moderately-sized eyes. First four segments of the pereion subequal in length, gradually increasing in width up to the fourth, which is the widest; next three segments subequal, slightly shorter than the preceding, curving slightly backwards at the sides; all the segments having the lateral margins straight or slightly rounded. Pleon as long as the four preceding segments of the pereion, pear-shaped, narrowing posteriorly, extremity rounded.

Antennules with the first two joints stout, others slender, reaching a little beyond the end of the third joint of the antennæ. Antennæ considerably longer than the body. First pair of legs very large and strong and of peculiar shape, the basos small, ischios very thick and strong, hollowed anteriorly to receive the distal end of the limb when bent back; carpus expanding distally, mallet-shaped; propodos small and rounded. Succeeding legs of normal shape, last three pairs longer than the others, about as long as the body.

Female with the body of the same shape as in the male, not broader; differs from the male in the first pair of legs, which are short and imperfectly subchelate, carpus broader