66 BRITISH FRESHWATER tlBLIOZOA. 



forated with nineteen minute pores ; plasma reddish in colour. 

 Diq^eter 45 fi to 50 /j. 



The genus Elaster Grimm contains one species, E. greeffi' 

 Grimm, which has a perfectly smooth spherical capsule 

 devoid of pedicel or projections and perforated by numerous 

 small pores. Diameter 20 /x. 



Choaiiocystis Pen. comprises one species, C. lepidula Pen.,, 

 in which the perforations in the envelope are provided with 

 conical borders, the smaller ends outwards ; the orifices of 

 these cones are provided with funnel-shaped extensions whose- 

 edges nearly touch one another. Diameter 13//. 



PSEUDO-HELIOZOA. 



This term has been applied by Penard to forms 

 which are more or less closely allied to the Heliozoa, 

 but at the same time have some of the characteristics 

 of the Proteomyxa or Flagellata. They include the 

 following species : — 



Gliondropus viridis Greeff, a form allied to the genus 

 Vampyrella. 



Nuclearia caulescens Pen., Glathrella foreli Pen., 

 (Text-fig. 194), Actinocoma ramona Pen., Artodiscus 

 saltans Pen. are all species that assume a spherical 

 form, but radial spines are wanting, the pseudopodia are 

 radiating, without central axes and mostly bifurcated 

 or branching. All the above appear to be most nearly 

 allied to the Proteomyxa. Myriophrys paradoxa Pen. 

 possesses radiating pseudopodia provided with stiff 

 axes, but in addition the body is densely covered with 

 vibratile cilia, whilst Dimorpha mutans Grruber has the 

 typical Heliozoan pseudopodia, but only two flagella. 

 The genus GiliopJivys Cienk. is another similar form, 

 linking the Heliozoa with the Flagellata. 



The genera Pythelion Frenzel, Actinovicmas Kent,, 

 and Monohid Schneider also have a heliozoan-Jike 

 appearance. 



Minchin has the following remarks on this subject : 

 " Especially remarkable are certain genera which 

 indicate a close relationship between Heliozoa and 



