4 P B E l . IM I N A R Y N O T IC E S .
Jeiiii. F. Tun. Flora of Tunbridge Wells. ByE. Jenner, A.L.S. (no date).
Kilt::. BaciJl. Die Kieselscbaligen Bacillarien, von F. T. Kiitzing, 1844.
Kiitz. Plnj. Gey. Phycologia Gcrmanica, von F. T. Kiitzing, 1845.
Kiitz. Sj). Alg. Species Algarum, von F'. T. Kiitzing, 1849.
Lgng. Tent. Tentamen Ilvdrophytologiae Dauicse. II. C. Lyngbye. 2vols.,
1819.
Frit. Anim. A History of Infusorial Anim.alcules. By A. Pritchard, M.R.I.,
1852.
Quek. II. C. Histological Catalogue of the College of Surgeons. By
J. Quekett.
Balfs, Ann. Papers in the Annals of Natural Ilistoiy, By J. Ralfs,
M.R.C.S., V. d .
71'. Sm. Ann. Papers in ditto. By Rev. W. Smith, F.L.S., v. d.
Thio. Ann. Papers in ditto. By G. FI. K. Thwaites, v. d.
The letters n. sp. denote that the species to which they are appended is
believed to be now for the first time described: W. Sm. that the species has
been previously described, or the generic or specific name been altered, by the
present writer; in the latter case the original appellation is given in the list of
svnomnns. In other cases the writers by whom generic and specific names
have been first employed are indicated by contractions, the signification of
which may generally be ascertained by a reference to the list of authors
given above.
The following abbreviations are adopted in the text:—
F.=Frustule.
F. V.=Front view of frustule.
S. V.=Side view of frustule.
V.=Valve.
I"=English inch.
The letters S. V. and V. may usually he employed indifferently, as in most
cases the outline of one valve, when its general surface is turned towards the
observer, is identical with that of the side view of the entire frustule.
The letters v.v. following the specific description imply that I have examined
a living specimen, and v.s. that 1 have seen the species only in a dry or
fossil state.
The letters which accompany the numbers in the Plates indicate that the
figures to which they are attached represent,—a, a side view ; h, a front
view; c, a front view of single valve; and d, self-division : when a numeral
alone is employed, the figure is that of a side view of a single valve.
The unit of measurement employed is that of an English inch, the magnitudes
being expressed in decimals, thus enabling those who may desire to
reduce the dimensions given to the various continental standards (when the
values of these are known), to do so by a simple process. The scale in each
nlate affords a ready means of ascertaining the size of the specimen from
which each figure has been drawn ; but where much diversity has been found
to exist in the dimensions of tlie individuals examined, the extremes observed
have been noted in the text.
The figures, unless when otherwise indicated on the Plates themselves, are
to be regarded as representations of the objects as seen under an amplifying
power of 400 diameters, and the details given may be taken as tests of the
defining capability of an instrument provided with a magnifying power o
that amount. In a few cases a lens of somewhat higher power has been
employed, to resolve and estimate the number of the strim, this designation
being applied in every case, not otherwise studied, to the transverse hues or
markings of the siliceous valves.
The following British Diatomaceous deposits, recent or suhfossil, are those
most frequently referred to :—
P e t e r h e a d D e p o s i t . Described in the Annals of Natural History, Aug. 1848,
by Professor Dickie.
P r e m n a y P e a t . Described in the Annals of Natural History, Aug. 1848,
by Professor Dickie.
D o l g e e l y E a r t h . Supplied by Chr. Johnson, Esq., Lancaster, 1850.
Noticed by him in the Annals of Natural History, June 1847.
Marl, Co. Down. Supplied by J. M'Adam, Esq., Belfast, 1849.
L o u g h I s l a n d -R e a y e y D e p o s i t . Supplied by the late William
EsqBelfast. Described in Magazine of Natural History for July 1839,
by Dr. Drumniond ; and noticed in the Annals of Natural History, e .
1850, by the present writer.
L o u g h M o u r n e D e p o s i t . Described in Annals of Natural History, Feb.
1850, by the present writer.
C a n t y r e P e a t . Supplied b y Prof. Balfour, and noticed in the Annals of
Natural History, April 1851 and June 1851.
Raasay Earth. Fossil Earth from the Island of Raasay, supplied by Prof.
Dickie.
A few species are referred to Foreign localities; these references hare been
determined bv specimens distributed by the London Opticians or known to
m i c r o s c o p i c a l "observers, and for the geimhieiiess of which the present writer
is unable to assign his personal authority ;-su ch notices may serve in some
degree to indicate the wide range of many of our native forms.