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. 



