128 
land. The first from this country was from a pond near Minneapo- 
lis, Minn., in collections made !>v Miss E. Butler. 
M. ring 
'tis. Bail., var. serrulata, n. var. (Plate Li., Fig. 15.) 
In size and form the same as the original type from Florida. 
Bailey describes it as " granular near the margins," but not as ser- 
rated. This new variety has the margins distinctly serrated. 
Found in large numbers in White Bear Lake, near Minneapolis, 
Minn., by Miss E. Butler. Diameter \\%-\2)0}JL by 125-145/1. 
M.f. 
(Plate LI., Figs. 6 and 7.) 
—Cell equal in length and breadth, two-lobed, end lobe exserted, 
its divisions spreading, producing a wide, shallow sinus ; lateral 
lobes usually simple, sometimes divided into two, narrow, linear diver- 
gent sections, furcate at apices. Length and breadth i40-i50/<. 
A singularly variable species; of thirty-one specimens examined by 
Rev. H. D. Kitchel and myself, twenty were of normal form, as in the 
upper half of figures 6 and 7, no arms divided ; five had all the lat- 
eral arms divided like the lower half of figures ; one had two arms 
divided and one single; two had only one arm divided, and three 
had each two arms divided. 
All from pond near Winter Park. Florida. 
The second form mentioned, with all the lateral arms divided, is 
near the form described (Desmids United States, p. in) as M. 
pseudofurcata, and needs further observations. 
Staurastrum, Meyer. St. Wolleanum, Butler, var. Missimmense, 
n. var, (Plate lt., Figs, i, 2 and 3 front, side and end views.)— A 
large smooth and beautiful form, fully one-half larger than the typ- 
ical plant from Minnesota. The arms are similarly constructed and 
arranged, but, in proportion with the body, are much longer, nearly 
equal m length to the diameter of the body; apices not notched, but 
tipped with several small spines. Diameter, including the arms, 
100-125/1. 
Grassy shores of lake at Kissimme, Florida, March, 1885. 
St. Tokopekaligense, n. sp. (Plate lt.. Figs. 4-5).— Cell smooth, 
semicell in front view oval with gradiating arms; end view triangular, 
each angle drawn out into a smooth arm nearly as long as the dia- 
meter of the body; two similar arms on each side; all at nearly equal 
distances, and furcate at the apices. Diameter, including arms, 75/<. 
This species occurs frequently in small coves of Lake Tokope- 
kahga, at Kissimme, Florida. It bears features in common with St. 
furcatum, Breb., but is about twice the size, has more arms, and has 
them differently arranged; the description "one spine at each angle, 
with two accessory spines at the base," or " three spines at each angle," 
does not apply. 
St. paradoxum, Meyeh., var. Osceolense, n. var, (Plate ll, 
Figs. 8-9.)-— This variety is near the typical form, but larger, and 
with the apices of the arms much more prominently forked. Spread 
of arms, 60-70//, 
St. longispimmi. Bail. — This species, hitherto recognized by 
Prof. Bailey only, was found by Rev. H. D. Kitchel, the past summer 
m Florida, and by myself in New Jersey. 
The front view was not described by Bailey and hence not men- 
