SPHENODBRIA FISkSIEOSTRIS. 61 



p. 523, 2 figs. ; Sarcodines in Oat. Invert. Suisse (1905), p. 108 ; in 



Brit. Antai-ct. Exped. I, 6 (1911), pp. 221, 253. 

 FoEEL Le Leman, III (1904), p. 137. 

 AvBEiNTZEPF in Trudui S.-Peterb. Obshoh. XXXYI, ll (1906), 



p. 301. 

 ScHOTTTEDBN in Ann. Biol, lacustre, I (1906), pp. 369, 370. 

 Beown in Naturalist, 1910, p. 93 ; in Brit. Assoc. Handb. Sheffield 



(1910). pp. 499, 500; in Ann. Scott. Nat. Hist. 1911, pp. 229, 231 ; 



in Naturalist, 1912, p. 181 ; in Scott. Natur. 1912, pp. 109, 112 ; 



1913, p. 208. 

 HoPKiNSON in Irisb Natur. 1910, p. 3. 

 Wailes & Penaed in Proc. R. Irish Acad. XXXI, Lxv (1911), pp. 19, 



52, 60, 61, 62. 

 Wailes in Scott. Natm-. 1912, p. 61 ; in Jrn. Linn. Soc, Zool, XXXII 



(1913), p. 213 ; in Naturalist, 1913, p. 148. 

 Sphenoderia lenta var. fissirostris 

 West in Jrn. Linn. Soc, Zool. XXVIII (1901), p. 329. 



Test small, ovoid, hyaline, composed of compara- 

 tively large elliptical imbricated plates of various sizes, 

 arranged more or less regularly in four transverse rows ; 

 transverse section sub-circular ; aperture small, linear, 

 with conical collar or neck ; nucleus large, with one or 

 more nucleoles ; two contractile vesicles usually 

 present; plasma colourless, granular, nearly filling the 

 test ; pseudopodia few, attenuate, radiating. 



Length 28-45 /.i ; breadth 20-30 /a ; aperture 8-16 /i, ; 

 thickness 5 per cent, to 10 per cent, less than the 

 breadth ; nucleus 10-12 /x in diameter. 



Habitat. — Wet sphagnum. 



England. — Cumberland^ Westmorland, and Lan- 

 cashire {Broion) ; Derbyshire (Broion) ; Bedfordshire; 

 Isle of Wight; Devonshire; Cornwall. 



Wales. — -Frequent in North Wales. 



Scotland. — Shetlands; Orkneys; St.-Kilda (5ro^OT^), 

 Outer Hebrides; Inverness-shire; Elginshire, Aber- 

 deenshire, Perthshire, and Argyllshire (Broiun) ; Skye ; 

 Dumfriesshire ; Kirkcudbrightshire and Wigtownshire 

 (Broivn) . 



Ireland. — Armagh; Clare Island and mainland,. 

 Mayo; Galway; Wicklow! (Hoplc); Limerick; Kerry. 



Whilst the test is small, the plates composing it are 

 large in proportion to its size ; their arrangement may 



