NEW SPECIES OF GREEN ALGAE 
fertilis ad 37 m latis inflatis; conjugatione plerumque laterali, rarius 
scalariformia ; zygosporis flavescentibus, ellipticis, 20-27^1 latis, 40- 
60 11 longis. 
Filaments usually scattered; vegetative cells 20-24 ^ X 50-105 /x, 
chromatophore one in each cell, making 1-6 turns; fertile cells inflated 
up to 37 m; conjugation mostly lateral, sometimes scalariform; zygo- 
spores yellow, elliptical, 20-27 M X 40-60 ix. 
This variety is of such common and general occurrence both in 
association with the type and without it, and intergrading forms are 
so rare — especially in the matter of the spores — that it seems advisable 
to give it a name. It differs principally in its smaller dimensions 
throughout and in the relatively shorter spores. In this vicinity S, 
catenaeformis usually has a cell diameter of 27-30 rarely as low as 
24 iJL, while the spore diameter varies from 27-33 M» usually being 30 ju, 
with a length of from 2-3 times the diameter. I have recorded the 
variety from ponds at Charleston, Casey, Oilfield, Lawrenceville, and 
Lerna' Type in Herb. E. N. T. Collection No. 1876. Plate XXVI, 
figures 3-4. 
Spirogyra circumlineata nov. sp. 
Cellulis vegetativis 40-48 latis, diametro 3-6-plo longioribus, 
dissepimentis planis; chromatophoro uno, gracili, anfractibus 4-8; 
cellulis fructiferis uno latere (in quo conjugatio sequiter) inflatis, 
altero rectis; zygospoiis ellipticis, 40-50^ latis, 70-125/^ longis, 
maturitate fuscescentibus, episporio lineamento uno plus minus longi- 
tudinaliter instructo. 
Vegetative cells 40-48 fj, in diameter, 120-240 jjl in length, dissepi- 
ments plane; chromatophore one, slender, making 4-8 turns in the 
cell; fertile cells swollen on the conjugating side only; zygospoies 
elliptical, 40-50 /X X 70-125 fx, yellowish-brown at maturity, the outer 
spore wall marked by a more or less longitudinal line. 
This species in so far as its fertile cells are concerned has much the 
same appearance as S. varians (Hass.) Kuetz., which occurs in the 
same ponds. From this species it is distinguished by the larger dimen- 
sions throughout, by the greater number of turns of the chromatophore, 
the absence of inflated sterile cells, and the rather prominent line 
extending around the spore. Recorded only from Marshall pond, 
four miles north of Charleston, Illinois, and the ponds on the Gray 
farm, southeast of Lerna. Fruits during May and early June. Type 
in herb. E. N. T. Collection No. 1353. Plate XXVI, figures 5-6. 
