394 CusHMAN: NoTES ON MICRASTERIAS 
species and varieties, considerably more than half of those reported 
from the whole of New England. The following species were 
found in the collections made in 1903. 
MICRASTERIAS RADIOSA Ag. 
A typical form of this species was common in Carver’s Pond, 
Bridgewater, but was not noted in any other of the collections. 
An average specimen measures long. 186 y, lat. 207 p, lat. isth. 
22 p, lat. lob. pol. 34 p. 
M. rapiosa Wollei var. nov. 
Found at Chilmark, Martha’s Vineyard. This variety is that 
figured by Wolle (Desmids of the U. S. ed. 2. 1892) on Plate 35, 
figure 3. It is not as wide as the typical form and is much 
smaller, with a row of minute granules bordering the edge of the 
sinuses, not quite as open as the specimen figured by Wolle. In 
some respects this variety tends toward MZ. papillifera, An aver- 
age specimen measures long. 152 p, lat. 146 p, lat. lob. pol. 28 4. 
M. DENTICULATA Bréb. — 
Found both in Carver's Pond, Bridgewater, and at Lake Wa- 
tuppa, Fall River. An average specimen measures long. 234 #4 
lat. 195 y, lat. lob. pol. 72 y, lat. isth. 25 p. 
M. APICULATA FIMBRIATA (Ralfs) Nordst. 
The form described by Ralfs in 1848 as J. fimbriata is con- 
sidered by Nordstedt as a subspecies of apicu/ata published by 
Ehrenberg several years earlier. Nordstedt includes under this 
subspecies the forms called by Wolle var. apiculata, var. elephanta, 
and var. xuda as well as Mz. simplex Wolle of the first edition, 
1884, which Wolle called WM. fimbriata var. simplex in the second 
edition, 1892. 
This form was found both in Carver’s Pond and Lake Wa- 
tuppa. Two specimens from the first locality were measured, the 
first, long. 186 y, lat. 180 y, lat. isth. 38 y, lat. lob. pol. 40; the 
second, long, 229 p, lat. 205 yp, lat. lob. pol. 50 p. 
M. Furcata Ag. 
Found both in Carver’s Pond and in Lake Watuppa. A speci- 
men from the latter locality measures long. 1804, lat. 160 4, lat. 
isth. 30, lat. lob. pol. s. proc. 224. The variability of this spe- 
