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PRESn-WATER ALO-T: of HAMPSIimE. 335
wliicli he was very fond. Diatoms he knew well, antl had made a
large collection, but his chief microscopic favourites were llotifcrs
and Infusorians. He took a very special interest in investigating the
flora and fauna of his own district—the Vale of Alford. He was tlie
life and soul of its Field Chib, of which ho was Honorary President till
his death. He was in hearty sympathy with those engaged in
scientific pursuits, and to the utmost of his power aided and
encouraged them. Perhaps his strongest point was his power of
stimulating others. Both to him and his accomplished wife the
writer is greatly indebted for collections of Desmid material from
all parts of the country. For the last few years they had to pass
the winter in the South of England, partly in the neighbourhood of
Newbury, and the collections made there have given rise to the
present paper.
(Edofjnniitm undulatum. Breb. E. blunt spines at each angle.
JhdbucJuBte setiijera kg. E. Length and breadth, lih /* ;
B. rectani/uUnis Wittr. E. length of spine, 3h /x.
OonatozijfjonPiulfsnDe'BsiYy. W. S. secedens DeBary. E.
G. DrebissoJiii DeBsii'y. E. Hijalotheca dissiliens 8ni. E. M.
Siihcerozos)i)a excdvatinn'RshUs. E. — (3. hidentulu Nord. M.
iS'.///v/»»/r/nonEoy&Bisset. E. W. y. tridentnhi ^ox({. E. M.
Zygospore cubical, smooth, Desmidiwn Sa-artzii Ealfs. E.,
with one or two short stout abundant. P.
Docidium coronatnm Breb, E. This species occurred in great
abundance in a gathering from Enbridge in February, 1888. /).
nodulosuin Breb. was equally abundant ; but what is of special
interest is that every intermediate form between the two was seen,
from 7iodtilostim proper, with the apex perfectly smooth, to coroudtum,
with the "corona" fully developed. Some examples had
granules barely visible ; others, forming a series, showed the
granules larger, till finally the evidently fully-developed crenated
apex of corundtum appeared. These two forms therefore appear to
be the extremes of one species, which may be arranged thus :
J), curunatum Breb. The fully-developed form. ft. nodulosiDii'Breh.
with smooth apex. The var. /3. is by far the commonest form in
this country.
D. Farquharsonii, u. sp. B. Medium-sized, about six times
longer than broad ; constriction slight : ring prominent, brown
base very slightly tumid, with one or two very slight undulations
near it ; frond gradually tapers to about half the breadth at the
slightly thickened truncate apex, which terminates with about 12
flattened elongated granules, giving it a slightly crenulated aspect
chlorophyll-bands about (5, wavy, with a clear circular space close
to the apex, containing lumierous moving granules; surface
punctate; enveloped in a narrow mucous sheath. Length 288-
381 /x; breadth at constriction, 40-12 /x ; do., basal swelling,
48-53 IX ; do., at apex, 22;", -27 /i. This very distinct species, which
I have a mournful ploasiuc in naming after my deceased friend Mr.
Farquharson, of llaughtoii, has been familiar to me for several
years. It is very rare, and is more frequently found among mosses
on wet rocks than in pools.