OLATHRULINA ELEGANS. 59 



1. Clathrulina elegans Cienkowsky. 

 (Plate LXXIII, fig. 1. Text-fig. 192.) 



Clathrulina elegans 



CIENKOWSKY Arch. mikr. Anat. Ill, 1867, p. 311, pi. xviii, ff. 1-15. 



GREEFF Arch, mikr. Anat. V, 1869, p. 467, pi. xxvi, ff. 1-7. 



HERTWIG & LESSER Arch. mikr. Anat. X, 1874, Suppl. p. 227. pi. v, 

 f. 4. 



LEIDY Rep. U.S. Geol. Surv. XII, 1879. p. 273, pi. xliv. 



FOULKE Proc. Acad. Nat, Sci. Philad. 1884, p. 17. 



PENARD Heliozoaires, 1904, p. 270, figs. 



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



WAILES & PENARD Proc. R. Irish Acad. XXXI, pt, 65, 1911, p. !'.. 

 Podosphsera hwckeliana 



ARCHER Qrt, Jrn. Micr. Sci. (N.S.) VIII, 1868, p. 67. 



Envelope spherical, homogeneous, colourless when 

 young, becoming yellowish or brown with age, per- 

 forated by numerous comparatively large openings 

 more or less circular or polygonal in shape ; the 

 envelope provided with a peduncle or stalk ; body 

 lobed, not filling the envelope, plasma colourless, 

 granular ; endoplasm not differentiated ; nucleus single, 

 placed centrally; contractile vesicles one or more; 

 pseudopodia of moderate length, slender, tapering, 

 granuliferous, without central axes, straight or forked. 



Diameter of the envelope 60 /x to 90 /x (Leidy 30 /x 

 to 44 //,) ; diameter of the openings in the envelope (5 /x 

 to lOjot; length of the stalk twice to four times the 

 diameter of the envelope ; diameter of the stalk 3 //, 

 to 4 JJL. 



Habitat. Ponds and moorland pools amongst aquatic 

 vegetation ; rare. 



Distribution. ENGLAND. - - Windermere, Westmore- 

 land (G. 8. West) ; N. Yorks ; White Moss, Lancashire, 

 Essex, Sussex (Cask). 



WALES. Llyn Ogwen (G. 8. West); N. Wales 

 (Archer). 



IRELAND. Lough Neagh, Co. Armagh (G. 8. West) ; 

 PWicklow (Archer) ; Clare Island, Mayo (Wailes 8f 

 Penard) . 



The envelope, which was formerly described as 



