THP] JJFE OP l^EVTTvR LAKE 85 



of B. satanicus present some remarkable features for not only are 

 the posterior spines reduced and curved inwards, but the foot open- 

 ing is situated on the dorsal side, which does not occur in any 

 other known Braehionus." Further investij?ation, however, has 

 shown the presence of both short and lonj;-spined forms in summer 

 (Aujjust 22, 1913), so that it is doubtful if these varieties are sea- 

 sonal ones. 



Platyias quadricornis. Reported from Main. Stump, and Spring 

 Lakes and fresh waters. It occurs in all of the zones of the lake 

 except the ooze. 



Keratella cochleari.';. Present in Spring Lake — also in fresh 

 waters. 



Keratella qnadrnta. Reported from Stump Lake and fresh water 

 lakes. 



Notholca striata thalasslca. There are a number of records 

 from Main Lake, where it is widely distributed but not common. 

 Reported also from Mission Lake (1914), Lamoreau Lake, and Lakes 

 C and P and in fresh waters. 



Mytilina ventralis brevispiita. One record only for Main Lake. 

 Recorded also in Spring Lake and in fresh water lakes of the 

 complex. 



Lecane inermis. Of occasional occurrence and widely dis- 

 tributed in Main Lake, and reported from East Lake and Mission 

 Lake and Lake C. 



Lecane tuna. Reported in two collections from Main Lake. 

 Also in Stump, East and Spring Lakes and fresh waters. 



Monostyla cornuta. Recorded only from Spring Lake and fresh 

 waters. 



Monostyla bulla. Present in a surface tow from Creel Bay 

 (8/13/12). Also in Stump and Spring Lakes and fresh waters. 



Monostyla lunaris. Two specimens in a surface tow from Ft. 

 Totten Bay (10/2/17) is the only record for Main Lake. Also in 

 Lake N and fresh water. 



Monostyla quadridentata. Reported from Minnewaukan Bay 

 (Main Lake) Spring Lake and fresh waters. 



Lepadella patella. Present in a few towings from Main Lake. 

 Also in fresh waters. 



Squatinella mutica. One record, from Ruppia, Creel Bay, 

 (8/26/14). 



Cohtrella adriatica. Occurs occasionally and is widely dis- 

 tributed in Main Lake. Present also in Mission Lake (1914-15) and 

 in Lakes A and P. 



Colurdla colura. Occurs occasionally and is widely distributed 

 in Main Lake. Reported also for Mission Lake (1914). 



