44 



BRITISH FRESHWATEK HELIOZOA. 



solitary habits, also in the appearance of the plasma 

 with its numerous coloured inclusions, but the outer 

 investment formed of ovoid instead of spherical 

 globules and its more exactly circular outline 

 differentiate it clearly. 



FIG. 187. Pompholyxophrys ovuligera. x 900. (After Penarcl.) 



P. exigua Hertwig & Lesser is distinguished from 

 both this and the preceding species by the very minute 

 size of the globules forming its outer covering. 



Genus 7. LITHOCOLLA F. E. Schulze. 

 Lithocolla F. E. SCHULZE Arch. mikr. Anat. X, 1874, p. 389. 



? lasma enclosed in a spherical outer envelope com- 

 posed of heterogeneous silicious elements, usually 



V 



