302 RECENT RESEARCHES IN THE DIATOMACER. 
allernifolium, Pyrola minor, Pinguicula vulgaris, Buzus sempervirens, 
yperus lengus. Several species not of a strictly south-western type are 
found in Hampshire, but, so far as is known, do not occur in Sussex. B 
way of illustration I may mention Parnassia palustris, Listera cordata, 
S. 
The species peculiar to Sussex are Phyteuma spicatum, Lonicera Xylos- 
teum, and Trifolium- stellatum, but none of these are admitted as being 
indigenous without question. The first is considered to be indigenous by 
most botanists who have collected it, and Babington, on what authority I 
now not, says the second is also; the last is believed to have been intro- 
duced with ballast. 
In concluding this imperfect sketch, I venture to express a hope that 
the Natural History Societies of Sussex will take steps to ensure the 
publication, in a collected form, of the scattered papers on Sussex botany, 
together with other available unpublished data, before the inevitable dis- 
appearance of many species which now exist in single localities, and are 
likely soon to be disturbed. 
RECENT RESEARCHES IN THE DIATOMACEZ. 
By tHe Rev. EUGENE O'Mzana, A.M. 
Pfitzer ranges the Cymbellee immediately after the Naviculacee. Some 
authors, as Smith h 
them as more intimately related, the connecting link between them being 
found in the common features of a median line and central and ter- 
minal nodules.  Pfitzer places the two families in immediate proximity 
on account of the genera Brebissonia and Anomoeoneis, which, while they 
resemble the Naviculacee in the 
related to the Cymbellee by the unsymmetrical character of the cell- - 
contents. ^ Compari i : 
the principal difference is that the Cynbellee have but a single endochrome- 
plate, while the Naviculaceg have two. The roup embraces the foilow- 
ing five genera :—1, Brebissonia, Grun. ; 2. 4nomoeoneis, Pfitz. ; E 
bella, Agardh; 4. Cocconema, Ehren. ; 5. Encyonema, Kütz. : 
, l. Brebissonia.—This genus was established by Grunow to receive à 
single species, B. Boeckii = Cocconema Boeckii, Ehr. and Kütz. we 
Doryphora Boeckii, W. Sm. The author had the rare opportunity 0 
observing this form in a living state, having found it abundantly 
harbour of Pillaw ; and describi 
for " 
: ; ship: tO 
1 unsymmetrical throughout, it stands in more intimate relationship 
Cocconema than to any other genus. Besides the plasm-sac lying 0n s 
