‘CUCURBITELLA MESPILIFORMIS. 49 
The only British record is from a pond, where it 
was found in the mud when the water was nearly dried 
up; im numerous previous gatherings from the aquatic 
vegetation it had not occurred. The collar or peristome, 
although usually four-lobed, is occasionally three-lobed, 
and Leidy represents such a test on Pl. xv, fig. 7. In 
the United States individuals as small as 97 w in 
length occur. Owing to the opacity of the test it is 
not possible to examine the plasma in the living 
animal. : 
1. Pontigulasia rhumbleri Hopkinson. 
(Plata TRILL, fies, 1 aud Y5 
Pontigulasia compressa 
RHUMBLER in Zeits. wiss. Zool. LXTI (1895), p. 105, pl. iv, £. 13 a, b. 
PenaRD Faune Rhiz. Léman (1902), pp. 316-317, 3 figs.; Sarcodinés 
in Cat..Invert. Suisse (1905), p. 61. 
AVERINTZEFF in Trudui §.-Peterb. Obshch. XXXI, 11 (1906), 
pp. 169-170. 
ScHOUTEDEN in Ann. Biol. lacustre, I (1906), 3, pp. 338, 339. 
(Non Pontigulasia compressa Carter, 1864.) 
Pontigulasia rhumbleri 
Hopkinson in Cash’s Brit. Freshw. Rhiz. II (1909), p. 162 (see also 
p.64), 
Test pyriform, compressed, formed of a chitinous 
pellicle covered with diatom-frustules with a small 
proportion of silicious grains; aperture elliptical or 
sub-circular without any definite neck or constriction 
of the test; internal diaphragm ribbon-shaped, widen- 
ing towards the ends, placed centrally a short distance 
within the aperture and attached to the broader sides 
of the test; plasma partly filling the test; nucleus 
single, placed near the fundus; pseudopodia lobose, 
long, numerous. 
Length 130 p to 1404; greatest breadth about 
three-quarters of the length; thickness about half the 
breadth. 
Habitut.—Sphagnum and aquatic vegetation in 
shallow water. 
Enauanp.—Cumberland (Brown). 
Vol. IV. 4 
