138 PROCEEDINGS OF SOCIETIES. 
trust it may afford some gratification to have his name asso- 
ciated with this species of a group kindred to his favorite 
and beautiful Diatomacecze. 
Penium Berginii, n. sp. 
Frond minute, about three or four times longer than 
broad, smooth, fusiform; segments cuneate; ends roundly 
pointed; endochrome irregular, or sometimes with more or 
less evident longitudinal fillets, also with a transverse pale 
band, and having close to each end of the frond a con- 
spicuous, well-defined circular cavity, containing moving 
granules, and each half usually having immersed in the rest 
of the endochrome a single central spherical corpuscle. 
Length of frond, ,+, to 345 of an inch; greatest breadth, 
sy Of an inch; diameter at the ends, ..¢, of an inch. 
1 feel very happy in being accorded the privilege of naming 
this species after the well-known microscopist, Thomas F. 
Bergin, Esq., M.R.I.A, President of the late Microscopical 
Society of Dublin; while I trust that gentleman may look 
upon this trifling compliment as a mark of unaffected, but 
sincere respect for his numerous scientific attamments, and 
more especially in regard to microscopy, the active pursuit of 
which has been interrupted owing to delicate health, at once 
greatly to be lamented for his own sake, as well as much to 
be regretted for the cause of science. 
The following is the Supplementary Catalogue of Desmi- 
diaceze found near Dublin (for preceding one vide ‘ Natural 
History Review,’ ‘ Proceedings of Societies, vol. iv, p. 36) :” 
Didymoprium Grevillit (A7v/z.), rather rare; though (like other filamentous 
species) when met with, sometimes plentiful. 
Leptocystinema Kinahani (mz), n. g., very rare. 
[Hitherto met with but in a single pond on the Shank- 
hill road, about a mile beyond Ballinascorney Bridge. | 
asperum = Docidium asperum (Bréd.), not rare. 
as Portil (mihi), not rare. 
Spheerozosma vertebratum (Bréb.), rare. 
i pulchellum (mhz), very rare. 
Micrasterias Jenneri (2a/fs), rare. 
Huastrum cuneatum (Jenner), rare. 
ke insigne (//ass.), not uncommon. 
Cosmarium Ralfsii (Bréb.), not uncommon. 
3 tinctum (2a//s), rare. 
Staurastrum O’Mearii (m7Az), rare. 
brevispina (Bréb.), rare. 
monticulosum (B7¢b.), rare. 
[Of this rare and preity species, I have found a quadran- 
gular variety (plate xi, tig. 16, exhibits an end view), as 
well as the triangular form recorded in Ralfs. The former 
differs from the latter only in possessing an additional side 
” 
2 
27 
