SPHENODERIA FISSIROSTRIS. 61 



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



Brit, Antarct. Exped. I, 6 (1911), pp. 221, 253. 

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

 AVERINTZEFF in Trudui S.-Peterb. Obshch. XXXVI, n (1906), 



p. 301. 



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

 BROWN 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 Irish Natur. 1910, p. 3. 

 WAILES & PENARD in Proc. B. Irish Acad. XXXI, LXV (1911), pp. 19, 



52, 60, 61, 62. 

 WAILES in Scott. Natur. 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 /x ; breadth 20-30 p ; aperture 8-16 p ; 

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

 breadth ; nucleus 10-^-12 JJL in diameter. 



Habitat. Wet sphagnum. 



ENGLAND. Cumberland, Westmorland, and Lan- 

 cashire (Brown) ; Derbyshire (Brown} ; Bedfordshire; 

 Isle of Wight; Devonshire; Cornwall. 



WALES. Frequent in North Wales. 



SCOTLAND. Shetlands; Orkneys; St. Kilda (Brown), 

 Outer Hebrides ; Inverness-shire ; Elginshire, Aber- 

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

 Dumfriesshire ; Kirkcudbrightshire and Wigtownshire 

 (Brown) . 



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 



