334 iiEV. T. R. R. STicumxc; on Crustacea 



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

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

 narrowed. The ilrst gnathopod is normal, the lingers closing 

 Avithout a gap, and the apical teeth overlapping. The second 

 gnathopods are very slender. In the fifth pcneojiods 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 mm. in length was ta,ken 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 JE G id M. 

 Genus ^ga Leach, 1815. 



^GA semicarinatus Miers. 



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



p. 115. 

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



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

 1891. „ „ Dollfus in Crust. Miss. C;ip Horn (A. 



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

 1914. „ urotoma Barnard, Ann. S. Afr. Mus. vol. x. p. 367, 



pi. 32 A. 



In a manuscript note Mr. Barnard identifies his urotoma with 

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

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

 dorsal carina which is recorded and figured by Dollfus and is 

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

 lentin on drift il/acrocys^ is near West Point Island. It measures 

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

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

 teen joints in that of the Cape specimen cannot be considered 

 important, as the total length of the Cape example was also 

 lai'ger, being 53 mm. 



Our specimen has the whole dorsal surface of the pleon and the 

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

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

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

 str-ongly bent with the apex acute and black. 



