NEBELA OOLLARIS. 95 



p. 247, t. i, f. 3 ; and in Zeits. angew. Mikr. V, 10 (1900), 

 p. 271 ; AVERINTZEV (pars) in Trudui S.-Peterb. Obshch. 

 XXXI, 1 (1900), p. 240; op. cit. XXXVI (1906), 2, p. 

 250; and in Ber. Susswass. nat. Ges. St. Petersb. I (1901), 

 p. 215; EYFERTH Naturgesch. mikr. Susswass. ed. 3 

 (1900), p. 264 ; GODET ? in Bull. Soc. Neuchatel, XXVIII 

 (1900), p. 77 ; LAGERHEIM in Forh. Geol. Foren. Stock- 

 holm, XXIII (1901), p. 515; G. S. WEST in Jrn. Linn. 

 Soc., Zool. XXVIII (1901), p. 321 ; and in Ann. Soc. Nat. 

 Hist, 1905, pp. 90, 92; MURRAY in Pr. R. Soc. Edinb. 

 XXV, 8 (1905), p. 614; and in Ann. Scott. Nat. Hist. 

 1907, p. 95; COSHMANN in Amer. Natur. XL (1906), p. 

 373; SCHORLER & THALLWITZ in Ann. Biol. Lacustre, I, 2 

 (1906), p. 260; SCHOUTEDEN (pars) in Ann. Biol. Lacustre, 

 I, 3 (1906), pp. 354, 356, f. 27 ; LANDACRE in Pr. Ohio 

 Acad. Sci. IV, 10 (1908), p. 429. 



Test in broad view pyriform, longer than the width, 

 variable within certain limits ; the crown broadly con- 

 vex, the sides sloping evenly downwards, straight or 

 with little convexity, to the slightly-convex or trun- 

 cate mouth. In narrow lateral view oblong, the crown 

 obtuse, the mouth without any notch. Substance of 

 the test colourless, and structurally variable, with a 

 surfacing of discs (circular or oval) generally uniform 

 but not infrequently mixed large and small, with rods 

 and square plates, not overlapping but laid edgewise, 

 diaphanous, and producing an ornamental ground- 

 work. The plasma colourless, always containing 

 chlorophyllous food-particles; nucleus normal; pseudo- 

 podia digitate, knotted or simple, short, three to six 

 in number. 



Dimensions : Length about 130 /A; breadth 86-90 p. 



In marshes amongst Sphagnum, widely distributed. 

 In Cheshire, common ; also about Criccieth, Towyn, 

 and Tan-y-Bwlch, N. Wales. Moel Siabod and 

 above Dolgam, Capel Curig, N. Wales ; and Calary 

 Bog, Co. Wicklow, Ireland (/. Hopkinson). Epping 

 Forest, Essex ; and Loch Ness, Scotland (D. J. Scour- 

 field). Pentlands and Aberfoyle, Scotland (W. Evans). 

 Orkney Islands and Hebrides (G. S. West). 



