154 Lake Maxinkuckee, Physical and Biological Survey 



larvae also. Whether their great abundance goes hand in hand 

 with the prevalence of malaria is a question yet to be investigated. 



Sterile filaments were collected with a diameter of 29 mic. and 

 length of cell of 174 mic. ; probably Spirogyra quadrata; another 

 with a diameter of 33 mic. and length of 140 mic. with 3 spiral 

 bands ; another with the cells measuring 35 x 105 mic. with only 1 

 spiral band; a fourth with cells measuring 65x205 mic. and 2 

 spiral bands; a fifth with cells 80 mic. in diameter and 75 mic. 

 long and 2 bands ; a sixth with cells measuring 70 x 125 mic. and 

 4 bands; a seventh with a diameter of 70 mic., cell-length 200 

 mic. and 3 bands; an eighth with cells measuring 125x220 mic. 

 The coarse Spirogyras of Lost Lake were noted conjugating in 

 early spring and a special trip was made a few days later to col- 

 lect them but they had produced spores, disintegrated, and dropped 

 to the bottom. 



Among many forms of Spirogyra noted at the lake which could 

 not be identified satisfactorily on account of having not been in 

 fruit, the following may be mentioned: 



56. SPIROGYRA MAJUSCULA 



Common along shore by the ice office; frequently left in pools 

 along the shore by the receding water. The filaments left in the 

 pools soon conjugated and formed fruit. Found with ripe spores 

 August 7, 1906. 



57. SPIROGYRA MIRABILE Hass 



Found conjugating among a lot of fine filamentous algse gath- 

 ered by hand along the east shore of the lake, August 8, 1906. 



58. ZYGNEMA sp. 



Zygnema is fairly common in the lake during the summer. Most 

 of our species are more slender than Spirogyra and form yellowish 

 green masses floating far out in the lake, and not clinging closely 

 to shore as most Spirogyras do. It was common in Lost Lake and 

 abundant in the shallow water near the ice-houses. 



None was found in fruit. 



59. MOUGEOTIA sp? 



This was quite abundant, especially in the shallower portions of 

 the lake, as in Outlet Bay and Lost Lake. Sometimes it grew 

 abundantly in great masses in the bottom, attached or rather 

 tangled up with short plants. Frequently it floated in large yellow- 

 ish-green, loose masses. It seems to thrive best when the water 

 is rather warm, though it often persists until late autumn, making 



