52 BRITISH FRESHWATER RHIZOPODA. 
1. Cryptodifflugia oviformis Penard. 
(See Vol. II, pp. 79-80, fig. 78.) 
2. Cryptodifflugia compressa Penard. 
(Plate LX, figs. 14-16.) 
Cryptodifiugia compressa 
Prenarp Faune Rhiz. Léman (1902), p. 428, 3 figs.; Sarcodinés in 
Cat. Invert. Suisse (1905), pp. 82-83. 
Waites & PENARD in Proc. R. Irish Acad. XXXI, txv (1911),' 
pp. 9, 15, 23, p. i, f. 2. 
Wares in Jrn. Linn. Soc., Zool. XXXII (1912), pp. 124, 133; in 
Naturalist, 1913, p. 146. 
PuayFalirR in Proc. Linn. Soc. N.S. Wales, XLII, 4 (1918), p. 656, 
pl. xxxviii, f. 9. 
Test small, ovoid, yellowish-brown in colour, trans- 
parent, homogeneous, compressed; transverse section 
elliptical; aperture terminal, elliptical, with a short 
neck; plasma clear, colourless, slightly granular; 
nucleus single, placed posteriorly, containing a small 
central nucleole; one or two contractile vesicles 
usually present; pseudopodia few, not long, pointed 
or digitate. 
Length 17-20 mw; breadth 14-18 yw; thickness 
8-10 mw; aperture 5-6 pw by 15-3 pw; nucleus about 
2 w in diameter. 
Halitat.—Sphagnum and aquatic vegetation. 
EncLanp.—Cumberland (Brown); Lendall, West- 
morland; N. Yorkshire; Shropshire; Buckinghamshire; 
Chillenden, Kent; Isle of Wight. 
Ireanp.—Belclare, Clare Island, and Caher Island, 
Mayo. 
Not a common species, and usually occurring 
in association with C. oviformis, -a much more 
abundant and generally-distributed species from 
which the greatly-compressed test and_ elliptical 
aperture distinguish it. The pseudopodia are very 
rarely displayed, the plasma being more often seen 
protruding from the aperture as a small lobular 
