84 THE LIFE OF DEVILS LAKE 



"I was ill doubt at first whether this form should not be called a 

 variet}^ of B. :\Iulleri with which structurally it is undoubtedly more 

 nearly allied than with any other species; but after comparing 

 it with the mounted specimens in my collection from various locali- 

 ties I have decided to give it specific rank on account of its strik- 

 ing shape." My reason for classing it here as a variety of B. plica- 

 tills are the occasional intermediate forms which occur in my 

 material as already noted.* 



Brachionus capsuliflorm quddridodatns. Of occasional occur- 

 rence and widespread in the main lake, and reported in one collec- 

 tion each for East Lake (1918) Stump Lake, Spring Lake, and 

 Lakes A., C, 0., and P. It occurs also in several fresh water 

 lakes of the complex. 



Brachionus urceolaris. Taken near the head of Minnewaukan 

 Bay in 1916. Also in fresh water lakes in the vicinity. As already 

 noted the former was nearly fresh at this time. 



Brachionus pterodinoides. This species, described by Rous- 

 selet (1918), is fairly common and widely distributed in the com- 

 plex and in fresh waters. While common, it appears only sporadic- 

 ally in the planeton collections, and hence there are not sufficient 

 data for plotting its seasonal distribution. It occurs first in early 

 May, disappearing again early in November. 



Brachionus calyciflorus pala. Reported from Minnewaukan 

 Bay. 



Brachionus dolahratus. Reported from Minnewaukan Bay 

 (June 6, 1921) and Spring Lake (July, 1920). 



Brachionus sataniciis (pi. 19, 20). This species, described by 

 Rousselet (1911), is one of the most abundant and characteristic 

 species in the lake. The curve of its seasonal distribution in j\Iain 

 Lake shows that two cycles, one major and one minor, occurred prior 

 to June 26 in 1912. Three of them are evident in 1913, with 

 maxima about June 11, August 1, and September 1, and in 1914 

 there are also three, with maxima between June 10 and 24 and on 

 July 2 and September 2. 



It is not only one of the commonest, but naturally also, one 

 of the most widely distributed species in the complex, occurring in 

 all the lakes examined except N and in fresh water as well. Lake 

 N is merely a temporary pool which possibly explains the apparent 

 absence of B. satanicus there. 



In a letter to the writer (July 17, 1912) Mr. Rousselet says 

 "I have found two distinct seasonal varieties of this species, evi- 

 dently winter forms, which during the warmer weather of July will 

 produce the normal type . . . These ... are not immature 

 . . . forms, for they carry eggs. These two seasonal varieties 



♦See p. S3. 



