226 Proceedings of the Royal Physical Society. 



long tails suggestive of those of the swallow-tailed butterfly, 

 and which may equal the foot in length. 



Very generally distributed. 



The type at Duddingston, Upper Elf Loch, Torduff, 

 Bavelaw Moss, East Cairn Hill, Fullarton, Hopetoun^ 

 Aberdour, Markinch, Loch Leven, Ochils, Bridge of Allan, 

 Aberfoyle, etc. The swallow -tailed variety at Nether 

 Habbie's Howe and Boltonmoor. 



C. ehrenhergi, Janson (6). 

 Hopetoun Woods, December. 



C. hahita, Bryce (3). 



Very common and general. 



Duddingston Loch, Lothian Burn, and Nether Habbie's 

 Howe, March ; Lochgelly and Doune, April ; Upper Elf Loch, 

 November ; Winchburgh and Hopetoun, December ; etc. 



C. quadricornifera, Milne (9). 



Almost as common as C. plicata. 



Duddingston, Upper Elf Loch, Dalkeith, Lothian Burn, 

 Leadburn, Bavelaw Moss, Winchburgh, Otterston, Lochgelly, 

 Ochils, Aberfoyle. 



C. papulosa, Thompson (15). 



Common and general. 



Duddingston, Upper Elf Loch, Lothian Burn, Fullarton, 

 Midcalder, near Aberdour, Lochgelly, Loch Leven, Gifford, 

 GuUane Links, Winchburgh, Doune, Bridge of Allan, Aber- 

 foyle. 



C. muUispinosa, Thomi^s,on (15). 



Midcalder, Gifford, Hopetoun, Lochgelly, Wemyss Woods. 



C. aculeata, Milne (9). 



GuUane Links, in moss, November. 



Genus Rotifer. 



A more compact genus than either of the others. All 

 viviparous; toes, three. The eyeless species do not form a 



