56 BEITISH FRESHWATER RHIZOPODA. 



1. Nebela bigibbosa Penard. 

 (Plate LXII, figs.' 5 and 6.) 



Nebeln bigibbosa 



PENARD in Mem. Soc. Geneve, XXXI, i, u (1890), pp. 161-162, pi. vi. 



ff. 85-97 ; Faune Rhiz. Leman (1902), pp. 575-576, f. 7 ; in Arch, 



Protist. II (1903), pp. 259-260, f. 7 ; in Rev. Suisse Zool. XIII. 



3 (1905), pp. 600-602, pi. xiii, ff. 16-19 ; Sarcodines in Cat. Invert. 



Suisse (1905), p. 70 ; in Brit. Antarct. Exped. I, Biol., 6 (1911), p. 



240. 



BLOCHMANN Mikr. Thierw. Siisswass. ed. 2 (1895), p. I?. 

 AVERINTZEFF in Trudui S.-Peterb. Obshch. XXXI, u (1906), pp. 



237-238. 



SCHOTTTEDEN in Ann. Biol. lacustre, I (1906), pp. 353, 356. 

 WAILES & PENARD in Proc. R. Irish Acad. XXXI, LXV (1911), pp. 9, 



10, 17, 44, pi. v, f. 3. 

 BROWN in Jrn. Linn. Soc., Zool. XXXII (1911), p. 80; in Ann. Scott. 



Nat. Hist, 1911, pp. 230, 231 ; op. tit. 1912, p. 112 ; in Scott. Natur. 



1913, p. 209. 

 EDMUNDSON 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 

 Avith an external lip ; nucleus not large, containing 

 several nucleoles ; plasma and pseudopodia normal. 



Length 135-170 p.; breadth 87-110 ^ ; thickness 

 50-55 fi ; aperture 34-45 /x. 



Habitat. Ground mosses. 



ENGLAND. Lodore, Cumberland, and Lancashire 

 (Brown] . 



WALES. Moel Siabod, N. Wales, at 2,500 feet 

 (collected by /. Hopkinson). 



SCOTLAND. Glen Eagles, Perthshire, and St. Kilda 

 (Brown). 



IRELAND. Castlebar, Clare Island, and Inishturk, 

 Mayo. 



