Fresh Water Algae in Vicinity of Montreal 395 



situations and from as widely separated parts of the 

 island as possible, including: — 



(1) The shore of the St. Lawrence at Verdun. 



(2) The quarries at Amherst Park. 



(3) The ponds and streams on Mount Royal. 



(4) The Back River and brooklets emptying into it 

 at Sault au Recollet. 



(5) The shores of the St. Lawrence at Riviere des 

 Prairies at Bout de 1 'He. 



(1) Verdun: 



Here, just opposite Nun's Island, the river is very 

 shallow' near the shore and abounds with small islands 

 among which it runs slowly, forming a low, swampy 

 tract of land. Reeds, rushes and sand-bar willows 

 (Salix longifolia, Miihl) line the water edge, and a great 

 variety of water weeds, such as Nymphaas, Utricularia, 

 Elodea and Myriophyllum, grow partly submerged in 

 the shallow water. Entangled with these and also 

 floating freely in the water, I found a great number of 

 species of Zygnema and Spirogyra, also a very little 

 Oscillatoria, some Nostoc, Pediastrum and quantities of 

 Desmids. Some Diatoms were secured attached to fila- 

 ments of Cladophora, which was found in abundance 

 growing fastened to stones. A pool inside of the old river 

 dyke contained an enormous amount of Lemna; and, in 

 March, ChEetophora was found growing in a thin film on 

 the sides of the aquaria in which some of this Lemna had 

 been placed. Leaves of Nymphsea, tufts of Elodea cana- 

 densis and other water weeds were collected and washed, 

 to secure forms attached to them. "When this locality 

 was visited, on the 30th of September, the water was 

 quite warm and abounded in animal life. I noted that, 

 although there were many species of algae present, there 

 were comparatively few individuals. Ulothrix occurred 

 in tufts, unmingled with other forms, but Spirogyra and 

 Zygnema were always associated with each other. No 



