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Of the papers submitted to us which we do not publish, one of 
the most interesting was by Mr. H. I). Geldart, on the structure 
and fructification of marine algai, a subject on which he is well 
qualified to speak, and another by the same gentleman on Crustacea, 
in which lie gave us a detailed account of two species of opossum- 
shrimps, the hearing organs of which are situated in the swimming 
flaps of their tails. He noticed a fact which does not seem to have 
been previously recorded, that the pink Yarmouth shrimp 
(Pandalus annul icornis) is luminous for the few minutes that it 
lives after being taken from the water, the eyes and eye-stalks 
glowing with phosphorescent light of an orange-coloured hue. 
Mr. Hy. Norton contributed to our May meeting an interesting 
paper on Hydrobia marginata as a geological test of climate. Two 
forms of these minute shells are described by Moquin-Tamlon, 
under the name of Bythinell < marginata and BythinrUn gibba. 
The former has too many whorls for identification with the shell of 
the Mundesley river bed ; but Moquin-Tamlon gives two varieties 
of B. gibba, one of which is also called marginata, with a single 
ridge, — and another, apbxa , with none ; and with these two 
varieties the Mundesley shell agrees — generally having no ridges, 
but occasionally having one ; although these varieties are referred 
to the South, the type shell (gibba) has been found in the most 
northerly department; his B. marginata is found in the Jura; 
and Mr. Norton points out that even in the southern departments, 
the favourite habitat of these shells is at the sources of mountain 
streams, where the winter cold is probably quite as severe as that 
of our own country.. 
In September Mr. (.’order gave us an interesting account of his 
visit to the Engadine from a naturalist’s point of view. I would 
express the hope, that other members of this Society would in like 
manner favour us with any scientific notes which they may here- 
after be able to make, during their various excursions of business 
or pleasure. 
At our November meeting an unpublished lecture by the late 
Rev. R. Lubbock, whose ‘Fauna of Norfolk’ is so well known, was 
read, in which the changes which have taken place in the zoology 
o 
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