80 Rhodora |. [Marc 
Bambusina Brebissonii Kg. Found frequently and in various 
stages of development. 
Desmidium cylindricum Grev. Occasional. 
D. Swartzii Ag. Very common. 
D. aptogonium Breb. Not commonly found. 
D. Baileyi Ralfs. Very common. Intermingled often with D. 
Swartsit. 
Sphaerozosma pulchrum Bailey. Typical form frequent. Var. 
planum Wolle. Found frequently. 
S. filiforme Rab. Fairly frequent. (No sheath observed.) 
Spirotaenia condensata Breb. Rare. But few specimens found. 
Penium closterioides Ralfs. Common. 
Closterium macilentum Breb. Fairly rare; found but a few times. 
C. acerosum (Schrank) Ehrb. Very common. 
C. striolatum Ehrb. Common. 
C. Dianae Ehrb. Common. 
C. acuminatum Kg. Frequently found. 
C. robustum Hast. Found at surface in September 1900 in great 
numbers with Anabaena, etc. Have not found this form before or 
since. 
C. rostratum Ehrb. Fairly common. 
C. setaceum Ehrb. Frequent. 
C. Brebissonii Delp. Common in a collection made July 4, 1902. 
Not observed before. 
C. ovale Ralfs. Common. 
Docidium crenulatum (Ehrb.) Rab. Fairly frequent. 
. trabecula (Ehrb.) Naeg. Common. 
. truncatum Breb. Fairly common. 
. baculum (Breb.) D'By. Fairly frequent. 
. nodosum Bail. Fairly frequent. 
. coronatum. Rab. Frequent. 
. repandum Wolle. Rare. 
Cosmarium moniliforme Ralfs. Fairly common. 
C. tumidum Lund, Common. 
C. taxichondrum Lund. Common. 
C. pyramidatum Breb. Common. 
C. margaritiferum Menegh. Common, 
C. Botrytis Menegh. Common. 
C. reniforme (Ralfs.) Arch. Granules fully as large as figured by 
Wolle. Not rare. 
SSESESS 
