224 PROCEEDINGS OF THE SOCIETY. 



Mr. E. J. Spitta then read his Report (which appears in extenso 

 in the Jonrnal) upon the lenses of the late Joseph Jackson Lister, and 

 on its conclusion requested the assistance of Fellows in collecting repre- 

 sentative examples of lenses by old makers to form a portion of the 

 Society's collection, corresponding to and completing the unique collec- 

 tion of Microscope stands. 



The President said all would agree with him that they were deeply 

 indebted to Mr. Spitta and Mr. Conrady for the very careful and 

 thorough way in which they had examined and reported on the Lister 

 lenses. 



He heartily endorsed Mr. Spitta's appeal to Fellows of the Society 

 to contribute to the collection of lenses, and he thought that any such 

 interesting specimens might well be sacrificed as private property to the 

 good of the community. He then proposed a hearty vote of thanks to 

 Mr. Spitta for his report, which was carried with acclamation. 



Dr. Shillington Scales then read a paper by Mr. H. J. Waddington, 



entitled " Notes on Slides of Chirocephalus diaphanus and Artemia 

 salina ; " the slides were on exhibition that evening through the kindness 

 of Mr. Lees Ourties. 



The President pointed out that the study of the unisexual develop- 

 ment of certain species was of extreme importance, and one on which 

 a considerable amount of work had still to be carried out. The Society 

 would wish him to thank Mr. Lees Curties and Mr. Waddington for 

 providing this opportunity of seeing specimens of the genus, as well as 

 for their interesting description. 



Mr. Scourfield said that ten years ago he was only able to find four 

 or five records of Ghirocejohalus in this country ; since then, however, it 

 had been found in quite a number of places, and in Cornwall it appeared 

 to be by no means uncommon. He had himself found it, on two or 

 three occasions, at Oxshott and Claygate, in the months of May or June. 

 With regard to the existence of Artemia in England, he thought it likely 

 that it would be found in places where the '* brine-pan " method of 

 obtaining salt from sea-water was carried out. The speaker did not 

 think that the apparent spines of the ova of Chirocephalus were really 

 such, l)ut that they represented the angles of a honeycomb structure 

 which surrounded the Qgg. 



Mr. Wilfred Mark W ebb mentioned that a large number of Chiro- 

 cephalus had been found in flood- water at Eton in May 1910 by the 

 assistant in the Biological Laboratory at Eton College. Mr. Webb had 

 exhibited some, which he had himself caught, at a soiree of the Linnean 

 Society, and apparently no one present had seen the species alive before. 



Mr. Michael regretted that Mr. Waddington's face was no longer 

 familiar at the Meetings of the Society, and considered the occasion 

 should not be allowed to pass without calling attention to the series of 

 successful observations which Mr. Vi^addington had conducted for many 

 years upon minute marine creatures. 



Mr. Hopkinson added another to the localities given for Chirocephalus 

 diaphanus^ namely, a shallow roadside pool near Bricket Wood, between 

 Watford and St. Albans. 



