62 BKITISH FRESHWATER HELIOZOA. 



2. Clathrulina cienkowskii Mereschkowsky. 

 (Text-fig. 193.) 



ClathruliiKi cienlcowslik 

 Mekeschkowskt Arch. mikr. Anat. XVI, 1879, p. 191, pi. x, f. 34. 

 Penaed Heliozoaires, 1904, p. 276, figs. 



Wailes & Pbnard Proo. 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 

 ajjertures having raised borders forming an alveolar 

 sui-face ; pedicel long, tenuous ; plasma greyish in 

 colour, containing numerous granules and food par- 



Fia. 193. — Clathrulina cienkowslcii. 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 /a to 40 /a; the pedicel 

 usually about five or six times the diameter of the 

 capsule in length, but sometimes attaining 300 /x, with 

 a diameter of about 2 ju, ; the apertures in the capsule 

 4 /A to 5 /u, in diameter. 



Habitat. — Aquatic vegetation. Rare. 



Difitribution. — Ireland. — Inishbofin, Gralway (Waihs 

 & 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. 



