62 BRITISH FRESH WATE It HELIOZOA. 



2. Clathrulina cienkowskii Mereschkowsky. 



(Text-fig. 193.) 



Clathridina cienkowskii 



MERESCHKOWSKY Arch. mikr. Anat. XYI, 1879, p. 191, pi. x, f. 34. 

 PENARD Heliozoaires, 1904, p. 276. figs. 



WAILES & PENARD Proc. B. Irish Acad. XXXI. pt. 65, 1911. p. 19. 

 WAILES J. Linn. Soc. Zool. XXXII, 1912, p. 126. 



Body small, partially filling the capsule ; capsule 

 spherical, thick, pierced with numerous small circular 

 apertures having raised borders forming an alveolar 

 surface ; pedicel long, tenuous ; plasma greyish in 

 colour, containing numerous granules and food par- 



FIG. 193. Clathrulina cienkowskii. x 375. 



tides ; nucleus placed centrally, containing a large 

 central nucleole ; one or two contractile vesicles 

 usually present ; pseudopodia long, granuliferous. 



Diameter of capsule 25 //, to 40 /x; the pedicel 

 usually about five or six times the diameter of the 

 capsule in length, but sometimes attaining 300 p, with 

 a diameter of about 2 p ; the apertures in the capsule 

 4 /x to 5 /x in diameter. 



Habitat. Aquatic vegetation. Rare. 



Distribution. IRELAND. Inishbofin, Gal way ( Wail PS 

 & Penard). 



Propagation by simple binary and multiple division 

 has been observed, also the formation of cysts, which 

 differ from those of G. elegans by being without 

 asperities on the surface. 



