112 



Dinamcsba mirabilis Leidy was found in the plankton but 

 once Apr. 12, 1898, in small numbers, at 52. 



Euglypha 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 Icevis 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 

 32. 



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 lim- 

 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 previ- 

 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 i 'n 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. 



