RHIZOPODA AND HELIOZOA OF SCOTLAND 113 



2. HELIOZOA. 



Heliozoa are never abundant in the drier moss collections, 

 but in some of the wetter tufts (probably originally sub- 

 merged) from the Isle of May, the following were 

 identified : — 



Actinophrys sol, Ehrenb. 



Acanthocystis erinaceus, Penard, with rather longer spines 

 than Dr Penard's figure shows. 1 



A cantJwcystis pertyana, A rcher. 



PompholyxopJirys ovuligera, Penard. 



GENERAL REMARKS. — Numerous small Amcebce or 

 amcebulae occurred, but without showing characters suffi- 

 ciently distinctive to refer them to particular species. 



A noticeable feature was the almost complete absence 

 of Difflugiae, no species being at all common, and most of 

 those one expects in moss being quite absent." Similarly 

 the only Nebela at all plentiful was X. tincta. In the St 

 Kilda material, a few empty tests of N. militaris and N. 

 tubulata were found, and these were probably stray specimens 

 from sphagnum. 



The abundance of Sphenoderia dentata in an active 

 condition in the Isle of May and St Kilda material 

 was noticeable. It was present under two forms — the 

 ordinary elliptical type (Fig. 12), and a second smaller 

 (33 m) more rounded variety (Fig. 13), with plates much 

 more distinctly imbricated (Fig. 14), and generally heavier 

 looking. Many individuals were charged with discs, pre- 

 paratory to reproduction (as in the specimen shown in 



Fig- 13). 



Capsellina timida l previously described from Sheffield and 

 Cumberland, was present in the St Kilda moss in numbers, 

 and was quite typical. The animals also contained com- 

 paratively large food-bodies, confirming my previous observa- 

 tions on this point. 3 



Heleopei'a sylvatica, a rather uncommon species, occurred 

 in the Isle of May in very small numbers, and showed the 



1 Les Heliozoaires deau douce, p. 268. 



2 One individual only of D. lucida was observed. 

 :J Jour?i. Linnean Soc. Z00L, xxxii., p. 80. 



5 p 



