ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 649 



second and third united. Second antennae with the three joints of the flagellum sub- 

 equal, and together equal to the last joint of the peduncle, which is slightly longer 

 than the penultimate, and considerably longer than the antepenultimate. Upper lip 

 with convex distal margin. First maxillae with two short thick plumose setae on the 

 inner plate, three spines on the apex of the outer, one of them considerably stouter 

 than the other two ; the outer margin of the apical part is very feebly fringed, the 

 inner margin carries some setules. The second maxillae have the apex divided between 

 a very small process and a rather broad plate. In the maxillipeds the epipod is more 

 than two-thirds as long as the large second joint, which is capped by a small apically 

 rounded almost unarmed plate ; the palp is a little shorter than the plate, though 

 reaching beyond it with its curved apical seta. 



The legs are rather spinose, with the second joint not very large, but the third 

 to the fifth stout, the sixth being abruptly narrower; the finger is slender, with two 

 setules on the inner margin. 



Uropods. The peduncle reaches little beyond the caudal segment, and is equal 

 in length to the finely fringed inner ramus, which is not quite twice as long as 

 broad, though seen edgewise it gives a very different impression. It is inserted a little 

 in front of, and is about three-fifths as long as, the lanceolate outer ramus. 



Colour, uniform light brown. 



Length, 3"60 mm., breadth, about 1'1.5 mm. 



Habitat. New Britain. 



" Oniscus ? angustus," Dana, from Tierra del Fuego, shows some resemblance to 

 this species, for which I had at first chosen the same specific name. Dana's specimen, 

 which was more than twice as long, had lost the antennae and uropods, 



Fam. Armadillidiidae. 



1885. Onisci (Section I.), Budde-Lund, Isopoda terrestria, p. 14. 



1893. Armadillididae, Stebbiug, History of Crustacea, p. 432. 



1898. Armadillidiidae, Sars, Crustacea of Norway, vol. 2, pt. 11, p. 187. 



1900. Armadillididae, H. Richardson, The American Naturalist, vol. 34, p. 305. 



Brandt in 1833 divides his group Armadillina into two sections, the first Arma- 

 dillidia, containing only his genus Armadillidium ; the second Cubaridea, containing 

 his two genera, Cubaris and DiploexocJms. Both sections are united in the present 

 family. 



Gen. Cubaris, Brandt. 



1833. Cubaris, J. F. Brandt, Bull. Soc. Nat. Moscou, vol. 6, p. 189 (Conspectus 

 Monograpliiae Crustaceorum Oniscodorum Latreillii). 



1833. Armadillo, Brandt, ibid., p. 191. 



1833. Diploexoclms, Brandt, ibid., p. 192. 



1840. Armadillo, Milne-Edwards, Hist. Nat. Crust., vol. 3, 177. 



1840. Diploea^ochus, Milne-Edwards, ibid., p. 180. 



1840? Pentheus, C. L. Koch, Deutschlands Crustaceen, Myriapoden und Arachniden, 

 Heft 34, No. 1 (Herrich-Schaffer, Heft 180, No. 1). 



