Genus Panoplæa, G. M. Thomson.

(Ann. and Mag. N.H., ser. v., vol. vi., p. 2.)

Panoplæa translucens, sp. nov. Pl. xxi., fig. 3, a to c.

Closely related to Panoplæa debilis, but larger and lighter in colour and differing in the following points. None of the segments produced posteriorly into spines. The two pairs of gnathopoda similar in shape and equal in size, much stouter than in P. debilis, basos with longish setæ on both sides, carpus nearly as long as propodos, propodos rectangular, slightly more than twice as long as broad, palm oblique extending about one-third along the inferior margin of the propodos, one stout seta on each side of the point where the dactylos impinges, numerous tufts of stout short setæ along inferior margin of propodos. Three last pairs of pleopoda very slender, fourth pair with peduncle considerably longer than the rami, concave above, upper margins with short stout setæ, outer ramus longer than the inner, both with setæ on the upper margin and at the end; fifth pair similar, but with outer ramus shorter than peduncle, and the inner one longer than the peduncle; sixth with peduncle stout, naked, rami equal, longer than peduncle, broad when seen from above, both margins with