A REVISION OF THti BRITISH TDOTELDjE. 749 



2. Genus Zenobiana, Stebbing. 



Zenobia, Risso, Hist. Nat. de V Europe Merid., 1826, v, p. 110; Miers, Joum. Linv. Soc. Lond., 1881, xvi, 



p. 19; Dollfus, Fenille d.jeunes Nat., 1895, p. 9. 

 Cleantis, Dana, Amer. Joum. Set. and Arts, 1849 (s. 2), viii, p. 427; ibid., 1852, p. 300; U.S. Explor. 



Exped., 1853, pp. 697, 707. 

 Zenobiana, Stebbing, Ann. and Mag. Nat. Hid., 1895 (s. 6), xv, p. 24; Norman, ibid., 1904 (s. 7), xiv, 



p. 443; Tattersall, Nord. Plank., 1911, p. 231 ; Issel, Ann. Mus. Zool. Napoli, 1913, iv, p. 2. 



Body somewhat slender, long and narrow, with parallel sides. Cephalon wider 

 than long. Eyes small, situated dorso-laterally. Antennae short ; flagellum short, 

 with single joint, or restricted number of joints. Maxillipede with five-jointed palp. 

 Coxal plates distinct, usually small and narrow. Metasome with three to five 

 segments, lateral margins of the terminal segment partly folded over the dorsal side 

 towards the depressed area at the posterior extremity. 



As already pointed out, Issel (35) regards the genus Cleantis, Dana, as synony- 

 mous with Zenobiana. Tattersall (76) in 1911 had previously pointed this out, 

 but was in favour of retaining Dana's name. He states, p. 231 : " Es scheint mir dass 

 die Genus Cleantis, Dana, sich als Synonym mit Zenobiana erweisen wied, und dass 

 daher, da der Name Zenobia sich nach Stebbing als schon vergeben erweisen hat 

 und daher fur das in Rede stehende Genus nicht wahlbar ist, das letztere den Namen 

 Cleantis tragen muss der ursprunglich von Dana fur dasselbe vorgesehen ist." 



As it stands at present the genus is an unsatisfactory one, including as it does 

 species widely separated from one another. Miss Richardson (60) has very rightly 

 placed the Cleantis isopus of Miers in a new genus, Cleantiella, " owing to the 

 differences in the shape of the body, which is broader and more flattened, and in the 

 character of the legs, and to the fact that the abdomen is composed of but two 

 segments." 



o 



(1) Zenobiana prismatica (Risso). (PI. X, figs. 103-114.) 



Zenobia prismatica, Risso, Hist. Nat. de V Europe Merid., 1826, v, p. 110, pi. v, fig. 24. 



Zenobia mediterranea, Risso, ibid., p. 111. 



Idotea chelipes, O. G. Costa, Fauna del regno di Napoli, 1838, p. 2, pi. xi, fig. 2a, b, c, 



Idotea prismatica, Heller, Verh. zool.-bot. Ges. Wien, 1866, xvi, p. 729. 



Idotea parallela, Bate ami Westvvood, Brit. Sessile-eyed Crust., 1867, ii, p. 391, fig. 



Idotea (subg. Zenobia) prismatica, Miers, Joum. Linn. Soc. Lond., 1881, xvi, p. 21. 



Zenobiana prismatica, Stebbing, Ann. and Mag. Nat. Hist, 1895 (s. 6), xv, p. 24; Norman, ibid., 1904 



(s. 7), xiv, p. 444; Tattersall, Nord. Plank., 1911, p. 231, fig. 120; Issel, Ann. Mus. Zool. Napoli, 



1913, iv, p. 1, figs. 1-9. 



Body elongated, narrow, with the sides of the metasome parallel. Cephalon 

 (fig. 103) wider than long, and wider anteriorly than posteriorly, anterior margin 

 curving very slightly inwards towards the median line ; dorsal surface convex, sloping 

 towards the anterior margin. Eyes small, dorso-lateral. Antennulse with first and 

 second joints slightly expanded, third joint small ; flagellum club-shaped, with 

 terminal setae. Antennae (figs. 104-108) short, first joint small, second widely ex- 



