46 



BRITISH PEESHWATEE HELIOZOA. 



Diameter of outer envelope 35 /a to 50 /x, usually 

 between 40 ju. and 45 fj, ; length of pseudopodia equal 

 to about the diameter of the body. 



Habitat. — Lakes, ponds and rivers ; also marine. 

 Rare. 



Distrihution. — N. Wales. — Capel Curig {G. 8. 

 West). 



Fig. 188. — LithocoHa globosa. On the right, the nucleus, further 

 enlarged. (After Penard.) 



West gives 23 fi as the diameter of the individual 

 observed by him and states that the sand grains com- 

 posing the envelope were small and compact, a descrip- 

 tion that might possibly indicate L. flavesceiis as having 

 been the species under observation ; the length of the 

 pseudopodia, 31/x, also gives support to this suppo- 

 sition. 



Schulze in his original illustration of L. globosa shows 

 the outer envelope composed entirely of coarse angular 

 sand grains. 



