140 Wailes: Ireshwater Rhizopoda of Yorkshire. 
ORDER CONCHULINA. 
FamMiILy ARCELLIDA. 
Arcella avenaria Greeff 
discoides Ehren .. 
hemisphevica Perty : 
polyvpora Penard.. 
vulgavis Ehren 
var. compressa Cash. 
” 
var. gibbosa (Pen. RS Gus. West 
Bullinula indica Penard . 
Centropyxts aculeata Stein 
var. discoides Penard 
var. ecornts (Ehren) Leidy 
Hf var. spinosa Cash .. 
avcelloides Penard 
laevigata Penard 
93) x 
Cochlio podium bilimbosum ( Auer) Leidy ' 
5 digitatum (Greeff.) Calk. 
Crvptodiffiugia ebovacensis Wailes 
= compressa Penard 
,,  ovtformts Penard 
i sacculus Penard 
Cucurbitella mespiliformis Perard 
Difflugia acuminata Ehren 
var. curvata 
var. inflata 3 
avcula vide Trigonopy ts. 
bacillifera Penard . 
bacillariarum Perty. 
var. teves Pen. 
brevicolla Cash. 
constricta (Ehren.) Leidy 
covona Wallich. es 
globulus (Ehren.) Hopk. 
gvamen Penard. 
lanceolata Penard. .. 
lobostoma Leidy. 
lucida Penard 
manitcata Penard. 
oblonga Ehren 
var. bryophila Penard. 
var. nodosa Leidy. 
subequalis Penard. 
if ovtformis Cash 
penardi Hopk. 
pristis Penard. 
5; pulex Penard 
vubescens Penard 
var. minoy Penard 
urvceolata Carter 
Heleoper a lata Cash. 
petricola Leidy. 
var. amethystea Pen. 
var. major Cash. 
yosea Penard. 
sovdida Penard 
var. elegans (Pen.) Hopk- 
var. lacustvis (Pen.) Cash 
tuberculata (Wallich.) Archer 
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Naturalist, 
