Journal of Proceedings. xlvii
two or three excursions into the district for the purpose, and it included
three species of fresh-water Algae not before found in Great Britain.
[Applause].
The list was as follows :—
Essex Fresh-water Algae (collected and determined by Dr. M. C.
Cooke, M.A., F.L.S., September, 1883.)
Chloeophyllophyceae.
Pleurococcus vulgaris, Men. Com-
mon.
Chlorococcum gigas, Grun. Wal-
thamstow.
Rhaphidium falcatum, Corda.
Snaresbrook.
Scenedesmus obtusus, Mey. Ditto.
S. acutus v. obliquus. Ditto.
S. quadricauda, Breb. Ditto.
* Hydrianum heteromorphum, Rein.
Ditto.
Volvox globator, Ehr. Ditto.
Gonium pectorale, Mull. Ditto.
Eudorina elegans, Ehr. Abridge.
Zygnema cruciatum, Vauch.
Snaresbrook.
Spirogyra nitida, Dill. Ditto.
8. weberi, Kutz. Walthamstow.
*S. orthospira, Cl. Kelvedon.
8. longata, Vauch. Waltham-
stow.
8. tenuissima, Hass. Ditto.
Staurospermum caerulescens, Hass.
Snaresbrook.
S. gracillimum, Hass. Ditto.
Mesocarpus pleurocarpus, D'By.
Walthamstow.
M. scalaris, Hass. Abridge.
Vaucheria geminata, Vauch.
V. sessilis, Vauch. Walthamstow.
Enteromorpha intestinalis, Linn.
Ditto.
Microspora fugacissima, Ag. Ditto.
Cladophora glomerata, L. Ditto.
*OEdogonium crassiusculum, Wittr.
Loughton.
CE. capillare, L. Walthamstow.
CE. boscii, LeCl. Ditto.
CE. pluviale, Nordst. Ditto.
Bulbochaete setigera, Ag. Snares-
brook.
Ulothrix zonata, W. and M. Wal-
thamstow.
V. tenuis, Kutz. Snaresbrook.
Draparnaldia plumosa, Vauch.
Ditto.
D. glomerata, Vauch. Ditto.
Chaetophora pisiformis, Ag. Ditto.
Walthamstow.
C. elegant, Ag. Snaresbrook.
Desmidiaceae.
Penium digitus, Breb. Waltham-
stow.
Closterium ehrenberghii, Men.
Kelvedon.
G. moniliforme, Ehr. Ditto.
C. rostratum, Ehr. Ditto.
C. lineatum, Ehr. Walthamstow.
C. lunula, Ehr. Kelvedon, Wal-
thamstow.
C. acerosum, Ehr. Kelvedon,
Snaresbrook.
C. diana!, Ehr. Walthamstow.
G. jenneri, Ralfs. Snaresbrook.
C. lebleinii, Kutz. Walthamstow.
Tetmemorus brebissonii, Men.
Snaresbrook.
Cosmarium margaritiferum, Turp.
Walthamstow.
C. botrytis, Bory. Ditto.
C. meneghinii, Breb. Ditto.
Micrastenas rotata, Ehr. Snares-
brook
Euastrum ansatum, Ehr. Ditto.
Staurastrum punctulatum, Breb.
Ditto.
Arthrodesmus convergens, Ehr.,
Snaresbrook.
Mr. Worthington Smith then read the following paper in his well-
* For the first time in Great Britain.