Smith—Phytoplankton of the Muskoka Region. 325 
The method of presentation of the data is the same as is em¬ 
ployed in the account of the Wisconsin phytoplankton 2 , and the 
same symbols are used to denote the frequency of occurrence of 
the different species. Citation of the original publication of the 
species has been omitted, however, in all cases where it has been 
given in connection with Wisconsin algae. Citation of descrip¬ 
tions of the Desmidiaceae is likewise omitted since the ground is 
amply covered by Nordstedt’s Index Desmidiacearum. The lakes 
from which plankton samples were collected are shown in table 1. 
Class MYXOPHYCEAE 
Order Coccogoneales 
CHROOCOCCUS Nageli 1849 
Chroococcus dispersus var. minor G. M. Smith 
Gull (2) (rr). 
Chroococcus limneticus Lemm. 
Basil (rr). Big Dudley (rrr), Black (2) (sss), Butterfly (r). Clear (1) 
(rrr), Clear (2) (r), Corner (rrr), Hamer (rr), Harbon (rrr), Henshaw 
(s), Joseph (s), (Lake of Bays (r), -Little Dudley (rrr), Long (1) (r), 
Long (2) (r), McGowan (ss), Marion (rr), Muldrew (r), Muskoka (rr), 
Otter (sss), Portage (rr), Rosseau (rr), Rowley (r), St. Mary (r), Silver 
(1) (r), Silver (2) (r), Vernon (r). 
Chroococcus turgidus (Ktz.) Nag. 
Clear (ss),Gull (1) (rrr), Mill (rrr), Vernon (rrr). 
MERISMOPEDIA Meyen 1839 
Merismopedia elegans A. Br. 
Basil (rr), Big Dudley (rrr), Clear (2) (rrr), Gull (1) (rrr), Marion 
(rrr), Mill (rrr), Strange (rrr). 
Merismopedia glauca (Ehr.) Nag. 
Silver (1) (rrr). 
Merismopedia tenuissima Lemm. 
Butterfly (rrr), Black (1) (sss), Gull (2) (rrr), Henshaw (s), Muskoka 
(rrr), Nine Mile (rrr), Rowley (sss), Vernon (ss). 
2 Smith, G. M., Phytoplankton of the inland lakes of Wisconsin Part I. Wis. 
Geol. and Nat. Hist. Survey Bull. 57, 1920. 
