12 PEOCEEDIXGS OF THE 



collected to the south of Arcachon in March and April 1906, was 

 that they represented gatherings of the plant from very different 

 habitats and showed great variations. The plants collected in 

 shallow ditches were already in full fruit, while those from 

 running water and those from Lake Cazan were quite immature, 

 and so far sterile. Only a few specimens of this species have 

 previously reached England, and the collection exhibited was 

 probably by far the most extensive series of forms yet obtained. 



Braun recognised two forms — the more typical one almost 

 resemblicig in habit some forms of our N. tenuissima (this form 

 Avas called f . moniliformis by Prof. Migula), and the other var. laxa, 

 which resembles N. gracilis. Among the specimens were some 

 from roadside ditches near Arcachon, representing a third and 

 very distinct form; this may be called var. rohusta. It is 4-5 in. 

 high, very dark green, much more robust than the ordinary form, 

 and with comparatively short ultimate rays to the branchlets, 

 giving it the appearance of N. mucronata in miniature. 



N. orniiliopoda is interesting as representing, in Europe, Braun's 

 section Polyabteeodactyl.e. The headquarters of the species in 

 this section is Australasia, where there are eleven species, two 

 reach north to Japan, and one occurs in India. Two or three are 

 found in South America, and one in North America. Three 

 species occur in Africa, one of which is also recorded by Dr. Nord- 

 stedt from Portugal. It is not qiiite certain that N. ornithojrjoda 

 is distinct from this last. 



The following papers were read and discussed : — 



Miss N. F. Layard, F.L.S. — " On the Ornamentation of the 



Frog-tadpole." (Abstract, p. 74.) 

 Mr. S. B. Kemp, B.A.— " Biscayan Plankton. Part XI. Decapoda." 



(Communicated bv Dr. G. Herbert Fowler, F.L.S.) 

 Prof. E. B. PouLTON, F.R.S., F.L.S.—" On the Colour-changes 



in South African Cliamaeleons." 

 Mr. (x. Claeidge Druce, F.L.S. — " On the Occurrence of 



Speri/ularia atheniensis and Agrostis verticiUata in the 



Channel Islands." (Abstract, p. 76.) 



March 21st, 1907. 



Prof. W. A. Herdmax, F.E.S., President, in the Chair. 



The Minutes of the General Meeting of the 7th March, 1907, 

 were read and confirmed. 



Mr. Richard Elmhirst was proposed as a Fellow. 



Miss Mary Anderson .Johnstone, Mr. Gregory Macalister 

 Mathews, Prof. Eichard Henry Aapp, and Mr. Charles Arnold 

 Newman were admitted. 



