66 BRITISH FKKSHWATKK HELIOZOA. 



forated wirlt nineteen minute pores ; plasma reddish in colour. 

 Diameter 4.")^ to 50 n. 



The genus Elaster (iriunu contains one species, E. grciff'i 

 (irimm, which has a perfectly smooth spherical capsule 

 devoid of pedicel or projections and perforated l>y numerous 

 small pores. Diameter 1^0 //. 



Ghoanocystis Pen. comprises one species, C. h-^'nlula Pen., 

 in which the perforations in the envelope are provided with 

 conical borderSj the smaller ends outwards; the orifices of 

 these cones are provided with funnel-shaped extensions whose 

 edges nearly t-uich one another. Diameter !'>/<. 



PSEUDO-HELIOZOA. 



This term has been applied by Penard to forms 

 which are more or less close] \ allied to the Helio/on, 

 but at the same time have some of the characteristics 

 of the Proteoinvxa or I'lauvllata. They include the 



* V 



following species: 



< '/HI//I/ i-i'i'ii* rtriili* (ireeff, a form allied to the genus 

 I ''iini>ifi-t'Un. 



Xnrlrtti-!,! caulescens Pen., ('In f lire/In f<n-<-li Pen., 

 (Text-fig. I'.'l-), Actinocoma ramoxa Pen., J //<//*(/'* 

 xulhiiix Pei). are all species that assume a spherical 

 form, but radial spino arc want ing, the pseudopodia are 

 radiating, without central axes and mosth bifurcated 



1 ' v 



or branching. All the above appear to be most nearly 

 allied to the Proteoinvxa. Myriophrys j><tr<i<l<>,r<t Pen. 

 possesses radiating psendojtodia proyided Avith stiff 

 axes, but in addition the bodv is densely covered with 



> 



vibratile cilia, whilst Dimorpha nintn/ix Grruber has the 

 tyjiical Heliozoan pseudopodia, but only two flagella. 

 The genus ( 'ili<>i>l<i-t/x Cienk. is another similar form, 

 linking the Heliozoa with the Flagellata. 



The genera Pythelios Frenzel, Actinomoiiax Kent, 

 and Mo)>l>i'i Schneider also have a heliozoan-Jike 

 appearance. 



Minchin has the following remarks on this subject : 

 " Especially remarkable are certain genera which 

 indicate a close relational ip between Heliozoa and 



