334 REV. T. R. R. STEBBING ON CRUSTACEA 



apex of the palp's fourth joint, like the two preceding joints, 

 provided with a crowd of setce. The broad third joint is apically 

 narrowed. The first gnathoj)od is normal, the fingers closing 

 without a gap, and the apical teeth overlapping. The second 

 gnathopods are very slender. In the fifth perteopods the penulti- 

 mate joint has the lower half of its front margin fringed with 

 small spines. The rami of the pleopods have very long fringes. 



A specimen nearly 7 inm. in length was taken by Mr. Vallentin 

 at Hoy Cove from a depth of 3-4 fathoms. The smaller specimen, 

 5 mm. long, he took from the surface. To this the text-figures 

 refer. 



The specific name is given in recognition of Professor H. F. 

 Nierstrasz's valued studies of the Isopoda. 



ISOPODA GENUINA. 



Tribe FLABELLIFERA. 



Family ^gid.e. 

 Genus ^GA Leach, 1815. 



^GA SEMiCARiNATUS Miers. 



1875. ^Ega semicarinata Miers, Ann. Nat. Hist. ser. 4, vol. xvi. 



p. 115. 

 1877. ,, „ Miers, Phil. Trans., Zool. Iverguelen, 



Crust., p. 2, pi. xi. fig. 1, 

 1891. ., „ Dollfus in Crust. Miss. Cap Horn (A. 



M.-Edw.) p. 57, pi. 8. figs. 2, 2 a. 

 1914. ,, iiroioma Barnard, Ann. 8. Afr. Mus. vol. x. p. 367, 



pi. 32 A. 



In a manuscript note Mr. Barnard identifies his iirotoma with 

 the jDresent species. His figure of the telsonic segment, however, 

 does not show nor does his description mention the slight medio- 

 dorsal carina which is recorded aiid figured by Dollfus and is 

 present in the Falkland specimen. This was found by Mr. Val- 

 lentin on drift Ilacrocystis nenv West Pomt Island. It measures 

 49 mm. in length, with a breadth rather over 21 mm. In the 

 first antenna the flagellum is 10-jointed. The difference of four- 

 teen joints in that of the Cape specimen cannot be considered 

 important, as the total length of the Cape example Avas also- 

 larger, being 53 mm. 



Our specimen has the whole dorsal sui^face of the pleon and the 

 last side-plates of the perseon strongly pitted. In the first 

 gnathopods the fourth and fiftli joints are very short, the sixth 

 has a minute process on the inner margin, and the seventh is 

 strongly bent with the apex acute and black. 



