MIEES AND HARGER 375 



is an instance of the group in whicli the flagellum of the 

 second antennae is rudimentary. Sars remarks that in his 

 opinion ' Harger's genus Synidotea [1878] should for the 

 present be retained for the two Arctic species 8. bimspida 

 and 8. nodulosa [(Kroyer)], both dififering distinctly from 

 the form described by Gu6rin-Meneville — Edotia tuber- 

 culata — in the well-developed, multiarticulate flagellum on 

 the second pair of antennse.' 



Oleantis, Dana, 1849, is distinguished by the flagellum 

 of the second antennse being all fused into a single piece, 

 but even this character is sometimes shared by Idotea 

 prismatica. The pleon in Oleantis may consist either of 

 one, two, three, or five distinct segments. The New 

 Zealand species, Cleantis Micola, Thomson, is eleven times 

 as long as it is broad. Mr. Chilton is disposed to regard 

 it as normally not a tube-dweller, though the type-speci- 

 men was found in a tube. The species with all the seg- 

 ments of the pleon fused, such as Gleantvs filiformis (Say) 

 from the United States, were referred by Dana and Harger 

 to a separate genus, Erichsonia, Dana, 1849. 



On this family the work by Miers already mentioned 

 and Harger's ' Report on the Marine Isopoda of New 

 England and adjacent waters ' are essential to the student 

 for the groundwork of his inquiries. 



