BRITISH FRESHWATER RHIZOPODA. 219 



With regard to the distribution of the Khizopoda generally, 

 no definite law seems to prevail. Species inhabiting our own 

 bogs and pools are common alike to Arctic and Temperate regions. 

 Eorms of Lecqiiereusia recorded from such widely separated 

 localities as the Rocky Mountains and New South Wales do not 

 vary in any essential feature from British examples. Neither 

 climate nor altitude seems to aifect them. The Ehizopodous 

 fauna of the Eastern and Western Hemispheres is practically 

 identical. 



Few, if any, species can be said specially to affect alpine 

 situations. The only ones, in my own experience, less common 

 in lowland than in alpine districts are Ditrema flavum, Arch. 

 (= Amphitrema flava, Penard*), and Ampliitrema stenostoma, 

 Niisslint {A. Wrighteanum, Arch., in part.). These scarce forms 

 were met with on Cader Idris. Archer, however, discovered 

 them in different localities in Ireland, which can hardly be 

 described as alpine or sub-alpine. 



Professor Gr. S. West, in his interesting record of the plankton 

 of the Scottisli lochs, mentions a number of species occurring in 

 deep water. Most of them {Clatlirulina^ of course, being an 

 exception) are denizens of Sphagnum bogs. The open waters of 

 a lake can hardly be considered their natural home. It is quite 

 conceivable, however, that they may have been washed out of 

 the Sphagnum and other mosses growing on the banks, or con- 

 veyed by currents from the shallow waters of the lake-margins. 



Some observations on new and little-known forms of Heliozoa 

 must form the subject of another paper. 



Class BHIZOFOBA. 



Order AMGEBINA. 



Family L o B o s A. 



Genus Amceba, Wirenberg. 



Am(eba pilosa, sp. nov. (PI. 26. fig. 8.) 



Animal resembling an average-sized A. villosa, with the same 

 pale-bluish or neutral-tinted finely granular endoplasm, and 

 containing, as in that species, a variety of food-corpuscles, mostly 



* ' Faune Rhizopodique du Bassin du Leman,' 1902, p. 638. 

 t Zeitschr. fiir wiss. Zool., Bd. xl. 



