SCIENTIFIC SOCIETIES. 155 
cress, the ova of L. peregra might have been accidentally introduced. Still 
his shells of the successive broods were all of similar small size and of the 
same remarkable thinness, which are characteristic of L. involuta quite as 
much as the inserted spire. Some were provided with a very short spire; 
others like Forbes and Hanley’s fig. 5, as above mentioned. I have before 
now-recorded, in the ‘Annals and Magazine of Natural History’ (ser. 4, 
vol. iv., 1869, p. 46), with a figure (Pl. iii., fig. 3), that the animal of 
L. involuta does not differ from that of L. peregra, and that the former is 
not an Amphipeplea at all. Still I was desirous to carry out, or see carried 
out, a second series of experiments; but since the death of Mr. Waller I 
have not had any opportunity. I am myself inclined to believe that Mr. 
Waller's observations and his results were quite reliable, and I should agree 
with him that they do prove L. involuta to be only a variety or form of 
L. peregra (Miiller), which we know is one of the most variable of our water 
shells. Isolated for a long period in a small mountain tarn, nearly a thousand 
feet above the lower Lake of Killarney, and finding only a scanty supply of 
lime and less food than in the lowland waters, L. involuta has probably 
altered its appearance, and has shrunk, as it were, into smaller dimensions, 
drawing in its spire at the same time, while its shell became thinner and 
thinner, till when first found it was held to present sufficiently distinct 
characters to be described as a new species.—A. G. More (74, Leinster 
Road, Dublin). 

SCIENTIFIC SOCIETIES. 
Linnean Society or London. 
February 21, 1889.—Mr. CarrurHers, F'.R.S., President, in the chair. 
Mr. G. A. Grierson was admitted a Fellow of the Society; and, ona 
ballot being taken, Messrs. Hindmarsh, Kirkby, Lowe, and Morton were 
elected Fellows. 
Mr. George Murray exhibited a fossil Alga, Nematophycus Logani, Carr. 
Mr. G. C. Druce exhibited some rare British plants from Scotland, 
amongst which were Calamagrostis borealis, Ranunculus acris var. pumilus, 
and Bromus mollis var. decipiens. 
Prof. Marshall Ward exhibited a sclerotium of a Fungus produced from 
_ a Botrytis spore, and explained the method by which it had been obtained. 
A paper was then read by Mr. F. Townsend, M.P., on Huphrasia 
officinalis, with a description of a new subspecies, and a discussion followed 
in which the President, Mr. J. G. Baker, and others took part. 
In the absence of the author, a paper by Mr. C. T. Drury on sexual 
apospory in Polystichum angulare was read by the botanical Secretary, 
Mr. B. D. Jackson, upon which remarks were made by Mr. Murray and 
Dr. D. H. Scott. 
