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CONTENTS. 
PAGE 
1. The Diatomaceae ; with special reference to Species found 
in the Neighbourhood of Hertford. By Isaac Bobinson 1 
2. The Becorded Occurrences of Land and Bresh-water 
Mollusca in Hertfordshire. By W. Denison Boebuck, 
B.L.S., and John W. Taylor .. .. .. 10 
3. Bemarks on the Land Mollusca, with reference to their 
investigation in Hertfordshire. By John Hopkinson, 
B.L.S., B.G.S.17 
4. List of Land and Bresh-water Mollusca observed in Hert¬ 
fordshire. By Ada Selby; J. Gwyn Jeeeeeys, LL.D., 
B.B.S., B.L.S., B.G.S. ; W. S. A. Griffith, B.B.C.S.; 
and Alfred T. Brett, M.D. Compiled by John 
Hopkinson, B.L.S.29 
5. Notes on Boulders and Boulder-clay in North Hertfordshire. 
By H. George Bordhah, B.G.S. (With two Plates.) 33 
6. On the Microscopic Structure of Boulders found in the 
North of Hertfordshire. By J. Vincent Elsden, B.Sc., 
B.C.S. (With three Plates.) .47 
7. Notes on Lepidoptera observed in the Neighbourhood of 
Sandridge, Herts. -By A. B. Griffith, M.A.58 
8. Notes on Mosses, with an Outline of a Hertfordshire Moss- 
Blora. By A. E. Gibbs.67 
9. Notes on Birds observed in Hertfordshire during the year 
1883. By John E. Littleboy .82 
10. Beport on Insects observed in Hertfordshire during the 
year 1883. By B. W. Silvester, B.B.Met.Soc. 91 
11. Notes on the Protozoa of Hertfordshire : Section Discosto- 
mata. By B. W. Phillips, B.L.S. (With a Plate.) 95 
12. List of Blowering Plants observed in Hertfordshire during 
the year 1883. By Ada Selby.101 
13. Meteorological Observations taken at Throcking, Herts, 
during the year 1883. By the Bev. C. W. Harvey, 
M.A., B.B.Met.Soc.. .. .. 103 
14. Beport on the Bainfall in Hertfordshire in 1883. By the 
Bev. C. W. Harvey, M.A., B.B.Met.Soc.112 
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