PHEYGANELLA ACEOPODIA. 75 



In Sphagrutm. Dunham, Cheshire ; near Towyn, 

 and at Criccieth, N. Wales. Killough, Co. Wicklow, 

 Ireland (/. Hopkinson). 



The resemblance of the test of Phryganella acropodia 

 to that of Diffiugia globulus is so close that in the 

 absence of living examples its presence in any collec- 

 tion cannot be determined with certainty. There is 

 risk also of its being confounded with I'seudodifflitgia 

 gracilis Schlumb. The three species, whilst differing 

 essentially in other respects, have tests which are cast, 

 so to speak, in the same mould, so that it is impossible 

 to pronounce certainly with regard to any particular 

 test under examination to which of the three it belongs. 



Phryganella a,cropodia is not often met with in the 

 living state ; it is most frequently found in gatherings 

 of Sphagnum from open moorland bogs during the 

 summer months. It is a cosmopolitan species. It was 

 found in a gathering from the Sikkim Himalaya, and 

 it would appear from Leidy's observations (' Freshw, 

 Rhiz. N. Amer.,' 1879) to be a common form on the 

 American continent. That author figured it as a form 

 of " DiffliKjia globulosa." 



2. (?) Phryganella nidulus Penard 

 (Fig. ^1.) 



Difflngia globulosa Leidy (pars) Freshw. Bhiz. N. Amer. 

 (1879), p. 96, t. xvi, ff. 1-6. 



Phryganella nidulus Penaed Fauiie Ehiz. Leman (1902), p. 

 419, ff. 1-4 (p. 420) ; and in Eev. Suisse Zool. XVI, 3 

 (1908), p. 449, t. xvii, ff. 1-3; Aveeintzev in Trudui S.- 

 Peterb. Obshch. XXXYI (1906), 2, p. 361 ; Schodteden 

 in Ann. Biol. Lacustre, I, 3 (1906), p. 360. 



Test very large, heavily incrusted with sand-grains, 

 and opaque ; generally with a few larger quartz 

 particles embedded in the crown or on the sides of 

 the test; the mouth concentric in dorsal view; the 

 outline of the test, when viewed laterally, hemi- 

 spherical. Plasma colourless ; the pseudopodia very 



