( 69 ) 
INDEX 
OF SPECIES, BTC., NAMED OR DESCRIBED IN Vow. LV,* 
Synonyms in italics. 
. PAGE 
Ameba Pen. 30 
Ameba alba Greeff ~ Ad 
fibrillosa Greeff 11, 12 
fluida Gruber 8 
granulosa Gruber . 9 
papyracea Pen. 11 
pilosa Cash 6 
proteus Leidy ‘ 9, 10° 
proteus Linn. : 9, 51 
var. granulosa Cash 9 
spheronucleolus Greef? . 11 
terricola Greeff 11, 12 
verrucosa Ehrenb. 
10 (syn.), 11, 12 
var. papyracea Pen. 10 
vespertilio Pen. 10 
vestita Pen. 33 
AMGBINA 8 
Amphitrema 
flavum (Arch.) Pen. 6 
Amphizonella Greeff 24 
flava Greeff 25, 26 
Arcella Carter . ‘ . 18 
Arcella Ehrenb. 5, 6, 18 (syn.) 
arenaria Greeff . 15 
artocrea Leidy 15 
artocrea Pen. 14 
aureola Maggi 16 
eatinus Pen. 14 
eurvata Wailes 17 
discoides Khrenb. 17 
PAGE 
Arcella hemispherica Perty 13 
megastoma Pen. . 17 
microstoma Pen. . 16 
patens Carter 19, 22 
patens Clap. & Lachm. 18, 21 
polypera Pen. . 18 
vulgaris Leidy 13, 14 
var. compressa Cash ‘14 
var. hemispHerica 
(Perty) v. nov. 13 
ARCELLIDA : 13 
ARCELLINE 13 
Averintzia Schout. 64 
cyclostoma (Pen.) Schout. 65 
Bulinella Pen. . 44. 
indica Pen. 45 
Bullinula Pen. . . 44 
indica Pen. 45, 46 
Capsellina Pen. 29 
bryorum Pen. 29, 30 
timida Brown 29 
Centropyxis Stein 44 
aculeata (EHhrenb.) Stein 
42, 43, 44 
var. discoides Pen. 34 
var. ecornis Leidy 43 
arcelloides Pen. 35 
Cochliopodium Hertw. & Less. 6 
bilimbosum (Auerb.) Leidy 67 
granulatum Pen. . 67 
obscurum Pen. 66 
* The figures in heavy type indicate the pages on which they are 
described ; in light type, synonyms and incidental references. 
