356 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



Proceeding's of the Society. 



SESSION 1901-1902. 



24rTH September, 1901. 



The first meeting of the fifty-first session was held this even- 

 ing, Mr. Alex. Somerville, B.Sc, F.L.S., President, in the chair. 

 Mr. James H. Lindsay, M.A., 37 Westbourne Gardens, Kelvin- 

 side, was elected an Ordinary Member. 



Miss S. B. Robbie read a report of the Societ/s excursion to 

 Toward (see page 333). 



The Rev. G. A. Frank Knight, M.A., F.R.S.E., exhibited a 

 small collection of about seventy species of North American 

 Land and Fresh-water Mollusca. The majority were of the 

 families Unio and Anodonta, which are found in extraordinary 

 abundance and variety in many of the rivers and lakes of the 

 United States. He remarked that the British Museum catalogue 

 gives a list of over 1,200 species of Unio throughout the world, 

 and that those from North America are noted for their weight, 

 the thickness of their valves, their rich purple colour inside, 

 their carination, and their excessive coiTUgation. He also gave 

 a sketch of the manner in which the continent has been divided 

 into molluscan regions, and concluded by a description of the 

 natural means by which the Unionidm have been dispersed and 

 distributed over the country. 



Mr. James Mitchell exhibited a similar collection of Unionid(B 

 from North America. 



Mr. John Renwick exhibited for Mr. Archibald Shanks a 

 specimen of Senecio erucifolius, L., from Kilwinning. This 

 plant is given in Hennedy's Flora of Clydesdale, all editions, 

 under the najne of " S. tenuif alius, Jacquin. Very rare. Wood- 

 hall, near Calderbank, a few miles from Airdrie (E.)," p. 7-8. 

 In Mr. P. Ewing's Glasgow Catalogue, second edition, 1899, 

 " Lanark " is the only county given, and " Kennedy " is the 

 authority, a quei-y being added. In the second edition of 

 Hooker's British Flora, 1831, the station is the same as in 



