56 BRITISH FRESHWATER RHIZOPODA. 
1. Nebela bigibbosa Penard. 
(Plate LXII, figs. 5 and 6.) 
Nebela bigibbosa ; 
PENARD in Mém. Soc. Genéve, XX XI, i, 11 (1890), pp. 161-162, pl. vi. 
ff. 85-97; Faune Rhiz. Léman (1902), pp. 575-576, £. 7; in Arch, 
Protist. II (1903), pp. 259-260, f. 7; in Rev. Suisse Zool. XIIT. 
3 (1905), pp. 600-602; pl. xiii, ff. 16-19; Sarcodinés in Cat. Invert. 
Suisse (1905), p. 70; in Brit. Antarct. Exped. I, Biol., 6 (1911), p. 
240 vey A ; 
BuiocuMann Mikr. Thierw. Siisswass. ed. 2 (1895), p. 17. 
AVERINTZEFF in Trudui §.-Peterb. Obshch. XX XI, 11 (1906), pp. 
237-238. 5 
ScHOUTEDEN in Ann. Biol. lacustre, I (1906), pp. 353, 356. 
Waites & PENARD in Proc. R. Irish Acad. XX XI, txv (1911), pp. 9, 
10, 17, 44, pl. v, £. 3. 
Brown in Jrn. Linn. Soc., Zool. XXXII (1911), p. 80; in Ann. Scott. 
Nat. Hist. 1911, pp. 230, 231; op. czt. 1912, p. 112; in Scott. Natur. 
1913, p. 209. 
Epmvunpson in Univ. Colorado Stud. IX (1912), p. 68. 
Test large, pyriform, compressed, yellowish in 
colour, composed of circular, oval, or elongated plates ; 
the crown in broad view semicircular, each side, at 
about one-third of the length from the aperture, 
furnished with a pair of pores situated in depressions 
-and connected by an internal tube; test in narrow 
side view elliptical, truncate at the aperture, with a 
small pore, just anterior to the internal tube, in the 
margin at each side; aperture elliptical, convex in 
broad view, notched in narrow view, and furnished 
with an external lip; nucleus not large, containing 
several nucleoles; plasma and pseudopodia normal. 
Length 135-170 mw; breadth 87-110 yw; thickness 
50-55 w; aperture 34-45 p. 
Habitat.—Ground mosses. 
Enotanp.—Lodore, Cumberland, and Lancashire 
(Brown). 
Wates.—Moel Siabod, N. Wales, at 2,500 feet 
(collected by J. Hopkinson). 
Scornanp.—Glen Hagles, Perthshire, and St. Kilda 
(Brown). 
Iretanp.—Castlebar, Clare Island, and Inishturk 
Mayo. 
3 
