Okeden, on Diatomacece. 
93 
No. 130. This is the acute variety of A. longipes {A. bre- 
vipes of Kutzing), also noticed by Dr. Arnott^ at p. 92 of the 
June, 1858, number of ' Microscopical Journal.^ I have 
nothing further to add to his excellent description of it. 1 
merely point it out as interesting to the observer. 
No. 140. I must call attention to this splendid gathering 
of Epif hernia Argus ; at least, to this species I refer it. The 
very conspicuous foramina on the F. V. would lead one to 
refer it to E. ocellata ; but the perfectly linear character of 
the F. V. precludes it from that species. Perhaps it may be- 
come a question at some future time, whether E. Argus and 
E. ocellata should not be united. 
Nos. 141 and 142. This gathering is from the same spot as 
the last. Here is the Navicula scita of Professor Smithes 
Pyrenean paper. A careful examination of the slide will 
show a variety of the above having a central inflation. 
This concludes all I have to remark on the gatherings of 
the living plant. I now pass on to the clay boreings, all of 
which are numbered separately from the other gatherings. 
These slides, twelve in number, consist of samples of clay 
from tidal deposits at various depths, obtained by a special 
boreing apparatus. A description of the apparatus and 
mode of using it, and also of the various clays, is given in a 
short paper of mine, in volume iii, p. 26, of the '^Micro- 
scopical Journal I need not, therefore, repeat it here. 
Nos. 1, 2, and 3, from brickyard, will be found rich in Trice- 
ratium favus (especially No. 1). In No. 2 will be found a 
good specimen of Triceratium armatum, first found by me in 
the Neyland mud. I am not aware whether it has occurred to 
any one else. And, lastly, in Nos. 1, 2, and 3, will be found 
also beautiful specimens of Mr. Roper^s Actinocyclus sedena- 
rius. 
No. 4. Again, in No. 4, which is a boreing of the Neyland 
mud, at twenty feet in depth, will be found some fine side 
views of that fine Diatom, Biddulphia turgida, of which I 
think I may also claim the first discovery. 
Nos. 5 and 6. Are also Neyland mud, but from a depth of 
thirty feet. These contain fine end views of the Biddulphia 
turgida. In all these slides, viz., Nos. 1, 2, 3, 4, 5, and 6, 1 
have marked with an ink ring all the objects of interest, so 
as to render the reference to them more easy. 
Nos. 7, 8^ 9, 10, and 11. Are from clays at various depths of 
fifteen to twenty-five feet, from the bed of the new docks now 
excavating at Swansea. These are all very rich in Epithemia 
musculus, while in Nos. 8 and 11 will be found good speci- 
mens of Surirella fastuosa. 
