1918] Notes from the Woods Hole Laboratory — 1917. 141 
NOTES FROM THE WOODS HOLE LABORATORY — 1917. 
Edited by F. S. Co L.ins. 
(Plate 124.) 
J. SPECIES NEW TO SCIENCE OR TO THE REGION. 
Tue summer of 1917 proved quite fruitful in novelties at Woods 
Hole, and from the data and material submitted to me by Dr. I. F. 
Lewis, of the botanical staff of the Laboratory, I have made up 
the following notes. The fresh water material is from Wood Pond 
at Woods Hole, and from Tarpaulin Pond, near Tarpaulin Cove, 
Naushon, Elizabeth Islands. Miss Jane M. Furber has made a 
special study of the flora of the latter pond, both as to species found 
there, and as to seasonal variations; the results of her study will be 
published later, and I here include from this station only species new 
to science or to this region. A new species of Erythrotrichia, from 
Woods Hole, collected by F. G. Gustafson, is described on the following 
pages by Ralph E. Cleland. A new genus of Conjugatae is of impor- 
tance enough to justify a special paper, which will soon be published 
by Dr. Lewis, who detected it in material from Wood Pond. 
 CHROOCOCCUS LIMNETICUS Lemmermann, Beiträge zur Kentniss 
der Planktonalgen, II. Bot. Centralblatt, Vol. LXXVI, p. 153, 1898. 
This is common in both Wood and Tarpaulin Ponds, among other 
algae. The cells are 8-13 u diam., aeruginous; the tendency to 
division is considerably less in one direction than in the other two, and 
as the cells remain much in the position assumed on dividing, the 
result is a Merismopedium-like frond in surface view; the cells are 
similarly placed, quadrately, but the outline of the frond is irregular, 
not square as in Merismopedium; moreover any large colony is at 
least two cells thick. It was reported from Lake Erie by Miss Julia — 
= W. Snow, The Plankton Algae of Lake Erie, Bull. U. S. Fish Com., 
p. 392, 1908, but has not been recorded in this part of the country. 
MıcrocHaETE naushonensis n. sp. Filamentis non attenuatis nec 
incrassatis, rectis vel subflexuosis, interdum erectis, vulgo prostratis; 
trichomate 6-7 u diam., purpureo, longitudine cellularum diametrum 
aequante, paullo plus vel minus; cellulis inferioribus cylindricis, 
indistinctis; superioribus subrotundatis, moniliformibus; vagina 
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