Zoological Society. 221 



PROCEEDINGS OF LEARNED SOCIETIES. 



ZOOLOGICAL SOCIETY. 



July 27, 1847.— Wm. Yarrell, Esq., Vice-President, in the Chair. 



Descriptions of new or little-known Crustacea in the Col- 

 lection at the British Museum. By Adam White, F.L.S., 

 Member of the Ent. Soc. of Stettin, and Assistant in the 

 Zool. Dept. Brit. Museum. 



Family Maiad^e. 

 Xenocarcinus, White, Appendix to Jukes's Voyage of H.M.S. Fly. 



Carapace long, narrow, knobhed above, with a very long thick beak; 

 beak cylindrical, horizontal, forming an elongated cone, truncated at 

 the end, with two small spines at the very extremity, one on each side. 

 Inner antenna? thickish, inserted in a deep groove, which is triangular 

 in front. Eyes with a short thick pedicel. Outer antennae spring- 

 ing from the under side of beak just in front of the eyes, eight- or 

 nine-jointed ; the first joint elongated, somewhat bent, the second 

 not half its length ; both furnished at the end with two or three 

 longish setse ; the other joints forming a bristle. The outer pedi- 

 palps together occupying a square space ; first joint very narrow at 

 the base, the inner edge finely serrated ; second joint very long, sides 

 almost parallel, the end gradually pointed ; third joint somewhat 

 pyriform, with a tooth at the tip. 



Legs cylindrical, some of the joints slightly curved ; claws long, 

 slightly curved, the inner edge with many closely-placed minute teeth. 



Tail (of female) trapezoidal, hollowed in the middle ; the segments, 

 excepting the terminal, joined in one piece. 



A genus closely allied to Acanthonyx, Latr. 



Xenocarcinus tujberculatus, White. 



Carapace with nine tubercles above, placed in three transverse 

 lines, the centre one of the first line double, one placed before the 

 other ; the centre one of the third line also double ; the two placed 

 transversely ; the greater part of the beak covered with minute 

 closely-placed hairs and scales ; two short lines of longer hairs on the 

 upper side above and before the eyes ; two or three waved longi- 

 tudinal red lines on the posterior half of carapace, the inner one con- 

 tinued to before the eye. 



First pair of legs (in female) short, not reaching to the end of the 

 beak ; the claws small, equal, and minutely toothed. 



Hab. Long Island, Cumberland Group, Australia. Caught in a 

 seine. Presented to the Museum by J. B. Jukes, Esq., geologist 

 attached to the survey of H.M.S. Fly. 



This very interesting form is described in the Appendix to his 

 Narrative of the Voyage. It will be figured in the forthcoming 

 Crustacea of the South Seas, in connexion with Sir J. C. Ross's 

 Voyage. 



