4 
Dinameba mirabilis Leidy was found in the plankton but 
once—Apr. 12, 1898, in small numbers, at 52°. 
Euelypha alveolata Duj. was found in small numbers in the 
plankton, but only on Nov. 1, 1898, and March 14, 1899, at tempera- 
tures of 45° and 36°. 
Euglypha ciliata Ehrbg. appeared in the filter-paper collections 
in 1897, in July, August, and November, in small numbers at tem- 
peratures ranging from 80° to 48°. This is said by Penard (02) to 
be predominantly a sphagnum species, but widely distributed 
elsewhere in small numbers. 
Euglypha levis Perty.—This minute rhizopod was found in the 
filter-paper collection of Oct. 4, 1898, at 72°. 
Nebela collaris Leidy was found only once—on June 25, 1898, at 
sae. 
Pontigulasia incisa Rhumbler.—This curious rhizopod occurred 
in the plankton in July and August, 1895, and again in August and 
September, 1897, at temperatures of 75°— 85°. Both occurrences 
were in stable conditions, and the temporary adoption of the lm- 
netic habit is suggested by their appearance at these times. Two 
other records in 1897—on March 22 and November 9, at 44° and 
50°— extend the seasonal range of the species. These occurrences 
attended rising water and were apparently adventitious. 
Trinema enchelys (Ehrbg.) Leidy.—Average number, 158. This 
little cosmopolite rhizopod of the sphagnum fauna was found but 
eight times in the plankton. The individuals observed were all dark- 
ened by the granular food vacuoles to such a degree that structural 
details were obscured. It was noted only in the somewhat turbu- 
lent years of 1898 and 1899, though on account of its small size and 
the obscurity of its structure it may have been overlooked in prev1- 
ous collections. The few occurrences are insufficient to establish . 
any seasonal routine. They were at both extremes of the tempera- 
ture range and in all seasons but spring, with a predominance in late 
summer and fall. The species is evidently adventitious in the 
plankton, as shown by irregular distribution and small numbers, and 
by the fact that its occurrences coincide in all instances but one with 
rising water. 
