i86 DISCOVERY REPORTS 



in the first pleopod of the male of Pseudidothea bonnieri OhUn. The form of the appendix musculina 

 on the second pleopod of the male is also very similar to that of P. bonnieri; it is considerably longer 

 than endopod (Text-fig. 22a), nearly straight, but decreasing in thickness so that its distal portion 



Text-fig. 21. Xenarctiinis spinulosus g.n., sp.n. (a) First pereiopod, x 32. (6) Serond pereiopod, x 32. 



(c) Fourth pereiopod, x 32. 



Text-fig. 22. Xenarcturus spinulosus g.n., sp.n. {a) Uropod (dorsal view), x 32. (b) First pleopod (right) rj, x 32. 

 (c) Second pleopod (left) S, x 32. (d) Third pleopod, (J, x 32. 



forms an acute point. The petiis is single, it is rather long and tapers to a rounded extremity. The 

 remaining pleopods (Text-fig. 22 d) are all similar. The protopodite of the uropod (Text-fig. 22 a) is 

 large and carries at its tip a small exopod and an endopod which is slightly larger. 



