146 
Cymbella cistula, Hempr. 
Cymbella lanceolata, Ehr. 
Encyonema_ventricosum, Kutzing. 
Eunotia lunaris (Ehr.), Grun., var. excisa, Grun. 
Surirella angusta, Kutz. 
Gomphonema acuminatum, Ehr. 
Gomphonema Herculaneum, Ehr. 
Gomphonema ventricosum, Greg. 
Rhoicosphenia Van Heurckit, Grun. 
Cocconets pediculus, Ehr. 
Cocconets placentula, Ehr. 
Epithemia turgida (Ehr.), Kutz. 
Navicula varians, Greg. 
Fragilaria capucina, Desmaz. 
In concluding this article it were not well to forget the con- 
stant courtesy and practical assistance rendered us from time to 
time since 1885 by our venerable friend, the Rev. Francis Wolle, 
and by Dr. Wm. Albert Setchell, who have each done much 
towards determining our humble collections of Montana alge, 
and towards encouraging our work in a region where all discour- 
agement possible, until very recently, has been perpetually cast in 
our Way. 
Myriophyllum Farwellii, nov. sp. 
By Tuomas Morone. © 
A few months since Mr. O. A. Farwell, of Ypsilanti, Mich., 
sent to the Herbarium a specimen of Myriophyllum, collected ina 
small pond in Keweenaw County, Mich., which without much ex- 
amination was referred to the form named by T. and G. &%. 
ambiguum, var. capillaceum. A subsequent study of the specimen 
convinced me that in some particulars it was distinct from any- 
thing hitherto published, and a more complete suite of plants sent 
recently by Mr. F. has confirmed my impression. It more near- 
ly resembles M. pinnatum (Walt.), (MZ. scabratum, Mx.) in the - 
flowers and fruit than any other North American species, but it 
is sufficiently different both in habit and botanical characters to 
merit specific rank. The stems are all submerged, and the flow- 
ers produced in their axils under water. Mr. F. writes that al- 
though quite abundant and frequently much longer than the depth 
