On the Galatheidea of the ^ Challenger^ Exindition. 407 Fig. 2. Optical longitudinal section through tentacular ring and adja-cent parts, a, wall of pharynx ; b, thinned margin of same, reflected to enclose c, circular sinus, which is continued into ff, canal of tentacle ; d, striated retractor muscle of tentacle ; e, perivisceral membrane, reflected over base of tentacle ; /, operculum. Fig. 3. A fulljr-developed but asexual zooid. a, cavity of pharynx ; b, gizzard ; c, sphincters of gizzard and stomach ; d, stomach ; e, intestine ; /, termination of intestine (?'. e. anus) ; g, termination of muscular tube attached round anus ; h, tufts of setfe crowning tentacles ; i, funiculus ; k, operculum. XXXIX. — Diagyioses of the new Species of Galatheidea col-lected during the ' Challenger ' Expedition. By J. R. Hendeeson, M.B., F.L.S. [Published by permission of the Lords Commissioners of the Treasury.] The present paper contains brief notices of the new species of Galatheidea obtained during the cruise of H.M.S. ' Chal-lenger.' As some time has elapsed since the return of the expe-dition in 1876, a number of the species then new to science have been retaken and described elsewhere. This is espe-cially the case as regards the group treated of, and four deep-water genera well represented in the collection, viz. Oalacantha, ElasmonotuSj Diptychus^ and Ptychogaster^ come under this category. I am indebted to the courtesy of M. Alphonse Milne-Edwards for the opportunity of examining his types from the ' Blake ' and the recent French expedi-tions. GalatheAj Fabr. Galathea pusilla^ n. sp. Rostrum triangular, nearly twice the length of the ocular peduncles, with a prominent tooth on either side of the base, and a minute one towards the apex (the latter is occasionally absent). Carapace smooth and glabrous, the strise not nume-rous, the lateral borders each with seven or eight spines ; gastric region with two small spines on either side of the median line. Chelipedes long and slender, the meral, carpal, and propodal joints each with three rows of spinules ; fingers parallel and finely toothed. Ambulatory limbs slender and compressed, with a few spinules especially on the meral joints. Length of body (in a (^ ) 10 raillim. ; length of chelipedes 11 millim.
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