84 The Ottawa Naturalist. [Oct. 



my study of his specimen was wholly my own, and neither he 

 nor Dr. Raymond are in any manner responsible for errors in 

 my paper. 



References. 



A. A fossil starfish with ambulacral covering plates. 

 By George H. Hudson, Ottawa Naturalist. Vol. 

 XXVI, p. 21-26, 45-52 (May, June-July, 1912). 



B. On the nature of the so-called "Covering plates," in 

 Protopalasaster narrawayi. 



By Percy E. Ravmond, Ottawa Naturalist. Vol. 

 XXVI, p. 105-108, Plate VI (December, 1912). 



C. The use of the Stereogram in Paleobiology. 



By George H. Hudson, New York State Museum 

 Bulletin, 164, p. 103 to 130, plates I-XIII; Annual 

 Report of the Director of the Science Division for 1912. 



HXCURSIONS. 



Billings' Bridge, Sept. 20, 1913. A most delightful fall 

 excursion of the Club was held near Billings' Bridge on the above 

 date. About 25 members were in attendance. The chief object 

 of the excursion was to study the aquatic plants which grow in 

 such profusion near the Islands, a short distance from Bank 

 Street. A sufficient number of boats had been arranged for, 

 and under the guidance of Miss F. Fyles, Assistant Botanist of 

 the Experimental Farm, observations were made and collections 

 gathered of many of the water plants of the vicinity. 



In midsummer the beauty of our Canadian water gardens 

 is so apparent as to attract the attention of even the unobservant : 

 masses of waxen arrowheads, gayly bright-blue pickerel weed 

 and water lilies, yellow, pink and white, bladderworts, or vellow 

 sunbonnets and water arums all in flower at once. But, in the 

 autumn, when the flowers have shed their bright petals, the 

 interest is in the fruiting heads of the reeds and rushes and in 

 the less conspicuous submerged plants; of the latter class, 

 the water- weed (Elodea canadensis), which becomes a great pest 

 in shallow canals, almost completely filling the passage with its 

 dense growth. Belonging to the same family is the ribbon grass 



