I(>2 
William J. HodgettS 
Dictyosphaerium Ehrenbergianum, Tribonema bombycinum and its 
forma minor, (Edogonium cryptoporum, (E, crispum, and other.species 
in the vegetative condition, Spirogyra calospora (= protecta), S. inflata, 
5 . colligata (20), Zygnema sp., Eyalotheca dissiliens, Cosmarium 
Botrytis, Staurantrum brevispinum , 5 . Dickiei, Xanthidium antilo- 
pceum, Closterium striolatum, C. moniliferum, Anabcena oscillarioides. 
Group 2 contains: Trachelomonas hispida, Synura uvella, Volvox 
aureus, Scenedesmus denticulatus var. linearis, A nkistrodesmus 
falcatus, and its vars. acicularis, and spirilliformis, Pediastrum 
Boryanum, P. tetras, Ccelastrum sphcericum, Chcetophora pisiformis, 
Draparnaldia glomerata, Aphanochcete repens, Tribonema affine, Vau- 
cheria aversa, CEdogonium Borisianum, CE. Braunii, (E. echinosper- 
mum, M ougeotia scalaris, M. viridis, Spirogyra catenceformis, S. 
longata, S. nitida, Sphcerozosma granulatum, Pleuroteenium Ehren- 
bergii, Staurastrum furcigerum, Closterium Diance, C. acerosum, 
C. Kutzingii, C. Uneatum, Oscillatoria tenuis, 0 . splendida, Phor- 
midium uncinatum, P. molle, Cylindrospermum majus. 
Group 3 includes: Euglena viridis, E. sanguinea, E. spirogyra, 
E. tripteris, Pkacus pleuronectes, P. longicauda, P. pyrum, Trachelo¬ 
monas oblonga, Chlamydomonas Debaryana, C. monadina, Gonium 
sociale, G. pectorale, Tetraedron minimum, Oocystis solitaria, Glceo- 
cystis gigas, Characium longipes, Apiocystis Braunii, Microspora 
floccosa, M. stagnorum, Coleochcete scutata, C. Nitellarum, Vaucheria 
sessilis, Edogonium rugulosum, Bulbochcete minor, B. intermedia, 
Spirogyra condensata, S. varians, S. Jurgensii, S. mirabilis, S. Weberi, 
S. maxima, S. bellis, S. Grevilleana, Cosmarium reniforme, C. im- 
pressulum, C. prcemorsum, C. Regnellii, Staur astrum inflexum, 
Penium Navicula, Arthrodesmus convergens, Closterium aciculare, Cl. 
Leibleinii, Cl. Ehrenbergii, Cl. rostratum, Cl. Venus, Gonatozygon 
Kinahani, G. monotcenium, Arthrospira Jenneri, Tolypothrix lanaia, 
Merismopedia elegans, Amphipleura pellucida, Synedra Ulna, S. 
radians, Fragillaria capucina, F. mutabilis, Tabellaria fenestrata, Gom- 
phonemaparvulum, G. acuminatum,Epithemia turgida,NitzschiaPalea, 
N. acicularis, Navicula viridis, N. vulpina, N. major, N. mesolepta, 
N. cryptocephala, Stauroneis anceps, S. Phcenlcenteron, Cocconema 
gastroides, C. Cistula, Amphora ovalis, Cyclotella Meneghiniana. 
VI. GENERAL ACCOUNT OF THE ANNUAL CYCLE 
OF THE PREDOMINANT ALGAL SPECIES 
It has been found convenient to consider the whole algal vege¬ 
tation of the pond as inhabiting two more or less distinct provinces, 
