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in a ditch in Spring Gardens, Norwich, what ho calls the “ Hair 
animalcule” (Oscillator ia limosa), and of which ho sends figures 
and description to the Royal Society. Mixe 1 with this form ho 
detected a number of minute organisms, which taxed the highest 
magnifying powers he possessed, to make out. He sent some of 
them to Baker, the celebrated microscopic observer, under the name 
of the “Oat animalcule;” and from the figure and description 
I have no doubt this was a species of Navicula, very probably 
N. amphisbeena or N. spluerophora ; and if I am correct in my 
surmise, the first diatom ever described or figured was a Norfolk 
specimen. 
In compiling the subjoined list, I have had to depend almost 
entirely on my own observations and specimens : no records of the 
labours of earlier observers (many of whom studied those remark- 
able forms with great assiduity) have been preserved. 
The late Mr. Briglitwell published in 1848, a small book called 
a ‘Sketch of a Fauna Infusoria for East Norfolk’ (I need hardly 
remark that at this time the animal nature of the Diatomaceae and 
Desmidke was scarcely doubted) : in this work he describes and 
figures the following species : — BaciUaria paradoxa, Navicula 
striatula=Surirella strialula , Navicula pheen icen ter on =S(a uroneis 
phcenicenteron , N. amphisbama, N. hippocampus= Pleurosigma, a 
“ Navicula ” which he does not name, but the drawings clearly in- 
dicate it to be Campylodiscus costatus. lie also gives figures of an 
Amphiprora, possibly A. palndosa, BaciUaria ( Diatnnia ) vulgare, 
Pyxidicula = Cyclotella opercidata and Cocconema = Navicula 
didyma. 
He subsequently described some species of Triceratium, Chmto- 
ceros, and Rhizosolenia found in this county, in the ‘Quarterly 
Journal of Microscopical Science;’ but his studies in later years 
were devoted to the forms found in guano, fossil deposits, and 
exotic gatherings. 
Campylodiscus clypeus was first found living in brackish water 
ditches near the Berney Arms, by the late Mr. R. Wigham ; a 
species previously supposed to be peculiar to a fossil deposit found 
at Egor in Bohemia, and was first described in Ehrenberg’s Micro- 
geologie ; accompanying this form were two species of Navicula: 
N. bohemica and N. sculpta. In Mr. Wigham’s Breydon gatherings, 
C. clypcus was also associated with these two forms ; the former 
