CANTHOCAMPTUS. EAS, 
inner branch (fig. 14) are reduced in size, and the 
small outer apical seta (a) is thickened and spine-like. 
The basal joint of the fifth foot (fig. 16) has only two 
principal spines on its inner segment. Abdomen 
composed of five seements. 
This pretty and graceful species occurs commonly 
in small freshwater pools and ponds throughout the 
country. I have no record of its occurrence at any 
ereat elevation, nor have I ever found it in lakes or 
very large sheets of water. ‘The reason of this I take 
to be that it prefers shallow water where the vegeta- 
tion is abundant; its colour seems to vary with the 
character of the plants and Infusoria upon which it 
probably feeds. The only considerable pieces of water 
in which I have found it are the lake in Axwell Park 
near Gateshead, and Holy Island Lough (Northum- 
berland), but both these are really, as to size and 
character of vegetation, big ponds rather than lakes. 
Miiller’s figures of Cyclops minutus, though in some 
respects inaccurate, as was unavoidable in the absence 
of the modern microscope, doubtless refer to the 
species under consideration. Jurine, however, dis- 
carded the name minutus, under the idea that still 
smaller species of the genus might subsequently be 
found, a reason which might have had some weight 
had Miller called his animal minutissimus, but to which 
we can scarcely allow any, as matters stand. Itseems 
to me due to the older author to retain his specific 
name which has the claim of undoubted priority. 
The females are very commonly found with a long, 
narrow, and curved spermatic tube attached to the 
