nr,A'l'HRULINA ELEGANS. 59 



1- Clathrulina elegans Cienkowsky. 

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



Clathruiinri elegans 



CIBNKOWSKY Arch. mikr. Anat. Ill, 1867, p. 311, pi. xviii, fE. 1-15. 



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



Hertwig & Lessee Arch. mikr. Anat. X, 1874, Suppl. p. 227, pi. v, 

 f . 4. 



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



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



Penaed Heliozoaires, 1904, p. 270, figs. 



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



Wailbs & Penaeb Proc. R. Irish Acad. XXXI, pt. 65, 1911, p. 19. 

 Podosphsera hseeheliana, 



Archee Qrt. Jrn. Mior. Scl. (n.s.) VIII, 1868, p. 67. 



Envelope splierical, 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 /i, to 90 /x (Leidy 30 ju, 

 to 44 /u,) ; diameter of the openings in the envelope 6 |U, 

 to 10 /x; length of the stalk twice to four times the 

 diameter of the envelope ; diameter of the stalk 3 jx 

 to 4 jLt. 



Habitat. — Ponds and moorland pools amongst aquatic 

 vegetation ; rare. 



Distribution. — England. — Windermere, Westmore- 

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

 Essex, Sussex {Gash). 



Wales.— Llyn Ogwen {G. S. West); N. Wales 

 (Archer): 



Ireland. — Lough -Neagh, Co. Armagh (G^ S. West) ; 

 ?'WiGk\ow (Archer) ; Clare Island, Mayo (Wailes Sf 

 Penard) . 



The envelope, which was formerly described as 



