ISOPODA. 
Orust. 29 
distinct segments in the post-abdomen; antennae with a multi- 
articulated flagellum. 
I. Subgen. Zenohia (Risso) : 4-5 distinct post-abdominal 
segments. 4 sp. 
II. Subgen. Armida (Risso) : 3 distinct post-abdominal seg- 
ments. 15 sp. 
III. Subgen. No name : 2 distinct post-abdominal segments. 
4 sp. 
IV. Subgen. Leptosoma (Risso), Crahyzos (Bate) : all post- 
abdominal segments consolidated into one piece. 5 sp. 
Gen. 2. Edotia (Guerin) = Desmarestia (Gay) = ? Epelys 
(Dana). Body ovate, epimera not distinctly separated ; 
basal opercular plates with an oblique line crossing their outer 
surface. 
§ 1. Synidotea (Harger). Antennae well developed. 3 sp. 
§ 2. Edotia^ s. str. Flagellum of antennae rudimentary. 
Post-abdomen 1-jointod. 4 sp. 
§ 3. Desmarestia (Gay), ? Epelys (Dana). Flagellum obso- 
lete. Post-abdomen 2-jointed. 1 sp. 
Gen. 3. Cleantis (Dana). Body oblong-ovate, slender ; epimera 
small, but distinct ; joints of the flagellum consolidated into 
a single piece. 
§ 1. Erichsonia (Dana). All post-abdominal segments 
coalescent. 3 sp. 
§ 2. Cleantis, s. str. Post-abdomen 2-5 jointed. 3 sp. 
All the species are described and their synonymy given, some new or 
little known ones being figured. J. L. S. xvi. 88 pp. 3 pis. 
Glyptonotus sabimi (Kroyer) = Chiridotea megalura (G. O. Sars), 
young specimen from Picton Rock glacier described ; id. 1. c. pp. 15 & 16, 
pi. i. fig. 5. 
Idotea entomon (L.) and sahinii (Kroyer), the former 100, the latter 
90 mm. long, plentiful on clay bottom in the sea north of the mouth 
of the river Lena ; Nordenskiold, “ Umsegelung Asiens auf der Vega,” 
vol. i. pp. 376 & 377, with figures. 
Idotea {Zenohia') whymperi, sp. n., Miers, 1. c. p. 23, pi. i. figs. 6 & 7. 
North mid-Atlantic, lat. 58^ N., long. 19° W., among seaweed. 
Idotea {Armida) marina (L.) — pelagica (Leach) = irrorata (Say) = 
tricuspidata (Desm.) = hasteri (Aud.), variable in colour and markings 
in the articulations of the antennae, and in the 3 or 1-cuspidated telson, 
distributed throughout the Mediterranean, Black, and Caspian Seas, 
German Ocean and Baltic, Eastern Coast of North America, Rio Janeiro, 
New Zealand, Red Sea, and ? Java ; Miers, 1. c. pp. 25-32. I. ochotensis 
(Brandt), Yedo, lacustris (Thomson), New Zealand, var. or sp. n. ? rotun- 
dicauda. Port Henry, Straits of Magellan, and whitii (Stimps.), California ; 
id. 1. c. pp. 32-42, pi. i. figs. 8-12, and pi. ii. figs. 1-3. I. indica (M.-Edw.), 
id. 1. c. p. 50, pi. ii. figs. 4 & 5. 
Idotea (ill.) peroni (M.-Edw.) = distincta (Guerin), Flinders’ Island, 
and lobata (White), sp. n., locality unknown ; id. 1. c. pp. 55 & 57, pi. ii. 
figs. 6-9. 
