108 PERCY SLADEN TRUST EXPEDITION 



Tribe VALVIFERA. 

 Fam. Idoteidse. 



Gen. IDOTEA, Fabricius. 

 1798. Idotea, Fabricius, Supplementum Ent. Syst., p. 302. 



24. Idotea metallica, Bosc. 



1802. Idotea metallica, Bosc, Hist. Nat. des Crustaces, vol. ii., p. 179, pi. 15, rig. 6. 



1881. Idotea metallica, Miers, J. Linn. Soc, vol. xvi., p. 35. 



1895. Idothea metallica, Hansen, Plankton-Exp., Isop., p. 10, pi. 1, rig. 3. 



1905. Idothea metallica. H. Richardson, Bull. U.S. Nat. Mus., No. 84, p. 362, 

 figs. 392, 393. 



1905. Idotea metallica, Tattersall, Fisheries, Ireland, Sci. Invest., 1904, n. [1905], 

 p. 50. 



In her valuable above-cited "Monograph on the Isopods of North America" Miss 

 Richardson quotes Miers under the date 1883, the date given on the title-page of the 

 Linnean Journal, Zool., vol. xvi., but the following page explains that the several numbers 

 were issued during the years 1881, 1882, 1883. The important paper by Miers belongs 

 to the first of those years. 



A specimen of this species only 6 mm. long was taken at the surface on the 9th of 

 September, 1905, between Saya de Malha and Coetivy. The head is wide, the telsonic 

 segment almost straight truncate with rounded corners, the colour dorsally as usual very 

 dark with a light border. Tattersall remarks that " /. metallica may be distinguished 

 from /. emarginata very readily by the presence of a small supplementary segment between 

 the cephalon and the first segment of the thorax." Miers says, " near the posterior margin 

 of the head is a deeply impressed arcuated transverse furrow." It is likely that this furrow 

 marks off the coalesced segment which carries the maxillipeds, but it would be rather 

 confusing to regard it as an independent segment. 



Tribe ASELLOTA. 

 Fam. Jseridse. 



1897. Ianiridaj, Sars, Crustacea of Norway, vol. ii., pt. 5, p. 98. 



1905. Janiridas, Stebbing, Herdman's Pearl Fish. Rep., pt. 4, No. 23, p. 48. 



1905. Parasellidse (part), Hansen, Proc. Zool. Soc. London, 1904, pt. 2, p. 315. 



1905. Janiridfe, H. Richardson, Bull. U.S. Nat. Mus., No. 54, p. 448. 



1910. JHeridse, Stebbing, J. Linn. Soc. London, Zool., vol. xxxi., No. 207, p. 224. 



Gen. JANIRA, Leach. 



1814. Janira, Leach, Edinb. Encycl., vol. vii., p. 434. 



1905. Janira, Stebbing, Herdman's Pearl Fish. Rep., pt. 4, No. 23, p. 49. 



1905. Janira, H. Richardson, Bull. U.S. Nat. Mus., No. 54, p. 468. 



25. Janira crosslandi, Stebbing. (Plate 6 a.) 



1910. Janira crosslandi, Stebbing, J. Linn. Soc. London, Zool., vol. xxxi., No. 207, 

 p. 225, pi. 22 A. 



