119 
The above list comprises 31 named forms, all of which are in 
my collection, but out of which the Rev. Francis Wolle, in his Dia- 
tomacea of North America, only mentions 17, leaving 14 ignored. 
He, however, adds A. incertus, A. Sm. as from Santa Monica and 
A. Peruvianus, Grev. from “ California,’ as fossil? He also men- 
tions A. mutabilis, Grev. from Monterey, but no such species 
of Greville exists. Probably A. miradilis was intended. It is 
seen from the above that 33 forms of Azlisci are at present 
known from the California diatomaceous deposits, which, during 
the earlier tertiary periods, must have been the veritable metropolis 
of the species of this interesting genus. 
As I propose preparing a revision of the Auw/scz in general, I 
should be glad to receive any additions to the above list from 
Californian localities, or the loan of any supposed new forms to 
, be added to the existing ones. 
31 BELSIZE AVENUE, 
Lonpon, N. W. 
Notes on New Characez. 
By. t>- Fi ALLEN: 
A new species of Nitella from the Valley of Mexico, collected 
in December, by Mr. Pringle, I decide to name MVitella formosa. 
It may be described concisely as Nitella diarthrodactyla, homoeo- 
phylla, monoica, flabellata, gymnocarpa, closely related to J. 
tenuissima, Kiitz. It has the appearance of a gigantic ¢enuzssima, 
attaining the size of 12 to 18 inches in length and diffusely 
branched. It differs, however, from ‘¢enutssima, not only as re- 
gards its size, but in that the fruit is subterminal only. The 
oospore is slightly larger than /enuisstma, in the new species 
averaging about .340 mm. long by .305 mm. wide, with seven 
striae. The membrane of the oospore is minutely granular, while 
that of zenuissima-is covered with much coarser granules or 
reticulations. ' 
I have also received from Japan a new JVitella, which is allied 
to our Mitella oligospira, and as in our species, the oogonium is 
single. The terminal extremities of the enveloping cells of the 
oospore become contracted, leaving spaces between the cells be- 
neath the coronula of mature specimens; the oospore is .340 by a 
