24 BRITISH FRESHWATER HELIOZOA. 



of green food, giving them a pale green colour and 

 hiding the nucleus from observation; in these young 

 forms noticeable vacuoles are usually absent. 



Groups containing several individuals are not un- 

 common. 



These variations in appearance and size are no 

 doubt accountable for the number of synonyms given 

 to this species. 



2. Actinophrys subalpina West. 

 (Plate LXVI, fig. 2.) 



Actinophrys subalpina 



West J. Linn. Soc. Zool. XXVIII, 1901, p. 335, pi. xxx, f. 36. 

 ? A. sol Yar. fusca 



Peistaed Heliozoaires, 1904, p. 113, figs. 



Body spherical or sub-spherical ; plasma finely 

 granular, colourless, free from vacuoles ; nucleus 

 placed centrally, large, granular, usually clearly 

 distinguishable ; contractile vesicle single, prominent ; 

 pseudopodia long, straight, rigid, tapering and granu- 

 liferous. 



Diameter of body 42 /x, to 61 ju, ; length of pseudo- 

 podia up to two or three times the diameter of the 

 body. 



Habitat. — "Wet moss on dripping rocks. 



Distribution. — N. "Wales, Snowdon ({?. 8. West). 



The locality in which this species was found is a 

 peculiar one for Heliozoa, and the altitude, namely 

 3000 ft., considerable. 



The plasma was of a yellowish colour and the 

 pseudopodia had smooth edges ; with the exception of 

 these characteristics the resemblance to A. sol var. 

 fusca Penard is very close, both forms being of large 

 size, the plasma free from vacuoles, nucleus large and 

 prominent and having a large protruding contractile 

 vesicle. 



