746 DR WALTER E. (JOLLINGE. 



the kindness of Professor G. 0. Sars, I have been able to examine examples from 

 Norway. Apart from being slightly smaller, they do not differ at all from the 

 specimens taken in St Andrews Bay, and they are practically identical with specimens 

 from Freshwater Bay, Isle of Wight, kindly sent to me by Mr W. Omer-Cooper. 



(8) Idotea metallica, Bosc. (PI. VIII, figs. 81-91.) 



Idotea metallica, Bosc, Hist, Nat. ties Crust., 1802, t. ii, p. 179, pi. xv, fig. 6; Latreille, Hist. Nat. 

 Crust., 1803, t. vi, p. 373. 



Idotea peloponesiaca, Roux, Crust, de la Me'dit., 1828, pi. xxx, figs. 10-12. 



Idotea atrata, Costa, Fauna del R. Napoli (Crust.), 1838, pi. xi, fig. 3. 



Idotea rugosa, Milne-Edwards, Hist. Nat. Crust., 1840, vol. iii, p. 131. 



Llothea robusta, Kroyer, Naturliist. Tidssk., 1846 (s. 2), vol. ii, p. 108, pi. xxvi, fig. 3. 



Idothea compacta, White, List Crust. Brit. Mus., 1847, p. 95. 



Idothea algirica, Lucas, Anim. artic. Expl. Sci. Algerie, 1849, vol. i, Crust., p. 61, pi. vi, fig. 2. 



Idotea robusta, Harger, Rep. U.S. Comms. Fish and Fisheries, 1880, p. 349, pi. vi, figs. 30-32. 



Idotea metallica, Miers, Journ. Linn. Soc. Lond., 1881, vol. xvi, p. 35; Norman, Ann. and Mag. Nat. 

 Hist., 1904 (s. 7), vol. xiv, p. 443; Tattersall, Fisheries, Ireland, Sci. Invest., 1904, No. 2 

 [1905], p. 50; Stebbing, Trans. Linn. Soc. Lond. (Zool.), 1910, vol. xiv, p. 108; Tattersall, 

 Nord. Plank., 1911, p. 227, fig. 116; nee Stephensen, Rep. Banish Oceauog. Exp., 1908-1910, 

 No. 3, 1915, p. 12, fig. 4. 



Idothea metallica, Richardson, Bull. No. 54, U.S. Nat. Mus., 1905, p. 362, 3 figs. 



Body oblong ovate, moderately convex, surface more or less rugose. Cephalon 

 (fig. 81) wider than long, anterior margin slightly emarginate, posteriorly with 

 deeply impressed furrow. Eyes large and round, situated dorso-laterally. Anten- 

 nulse (fig. 82) extending to the end of the second peduncular joint of the antennae. 

 Antennae (figs. 83 and 84) short and robust, joints 1 to 4 of the peduncle short, 

 fifth joint longer ; flagellum short, with eight to ten joints. First maxillse (fig. 85) 

 with outer lobe terminating in nine plain spines and three toothed ones, inner lobe 

 with three elongated setose spines. The segments of the mesosome (fig. 89) almost 

 subequal, anterior angle of pleural plates of first segment bluntly rounded. Coxal 

 plates occupy the whole of the lateral margins of the second to seventh segments, 

 posterior angles of those of the fifth to seventh produced backwardly as sharp spines. 

 Maxillipedes (fig. 86) broad, joints of the palp and basal plate short and broad, as also 

 the epipodite ; inner distal lobe large. Thoracic appendages (figs. 87 and 88) robust. 

 Metasome (fig. 90) with two short segments and strongly marked lateral sutures, 

 indicating a further coalesced one, terminal segment with a strong median ridge, 

 lateral margins converging to a truncate extremity. Uropoda (fig. 91) oblong, with 

 almost parallel sides, endopodite with slightly sloping lateral margins, posterior 

 margin truncate, setose style short. 



Length of $ 23 mm., of £ 18 mm. 



Colour (in alcohol) bluish-green. 



Geographical Distribution. — As previously pointed out, this species has not as yet 

 been found in St Andrews Bay. Dr Scott informs me that he took it oft" the N.E. 

 coasl of Scotland in L909. I have examples from South-West Ireland (whence 



