l.Ü,
This species differs from the previous one in being much
smaller, more finely striated, and having longer setaceous
appendages.
d. Closteria smooth, not appendaged, straight
10. Closterium L un ula Ehr.
Plate L X X X IV . Fig. 4.
Char. Frond fusiform, ventricose, loith rounded extremities.
Granules numerous, scattered. Endochrome fasciated,
bands usuallg three.
Cl. Lunula Ehr., Die Infus. t. v. figs. 1. and 3. C. Lunula
Menegh., Synops. Desmid.
Hab. Beckley Furnace: Mr. Jenner. High Beech: A. H .H .
This species I noticed when examining some Pediastra
kindly sent me by Mr. Jenner. I t is figured by Ehrenberg
as a state of Closterium Lunula, and indeed Meneghini regards
it as that species, conferring the name of Ehrenberg upon
what better agrees with the name of Lunula, and with
Ehrenberg’s description, although this last is evidently so
contrived as to embrace both species. The frond, in Mr.
Jenner’s specimens, was not of the gigantic size figured by
Ehrenherg.
11. Closterium acerosum DAr.
Plate L X X X V I I . Fig. 5.
Char. Closterium fusiform, gradually attenuated towards
each extremity. Granules in a single series down the
centre o f the frond. Endochrome handed.
Corpicetti a baccillo Coriil Observaz. Micros, p. 111. t. 11.
fig. 17. i. g. and r. s., 1774. Vibrio Lunula Miiller, Animale.
Infus. taf. 7. f. 12., 1786. Vibrio acerosus Schrank,
Fauna boica. 111. 2. p. 47., 1803. Baccillaria multistriata
Hempritch et Ehrenberg, Symbolic Physicse, Phytozoa,
pi. il. Sanaitica, £ 9. 1828. Closterium multistriatum,
Abhandl. der Akademie d. Wissensch. zu Berlin, 1829,
P- 15—20. Closterium acerosum, Symholae Physica;,
Evertebrata, text 1830 (1831); Polygastrica, fol. b.
a. 2. Closterium acerosum, Abhandl. der Akademie d.
Wissensch. zu Berlin, 1831, p. 68. Closterium Lunula
Morren, fig. 43 .; Ehr. Infus. p. 93. pi. vi. fig. 1. Cijm-
bella Hopkirkii Moore, in Ord. Survey; Harv., in
Manual, p. 215. Cl. acerosum Jenner, in Flora of
Tunbridge Wells, p. 196. Conf. ovata. Flora Glottiana.
Hab. Near Glasgow : Mr. Hopkirk. About Lisburn and
in one of the caves. Cave Hill, Belfast: Mr. Moore.
Warbleton, &c.: Mr. Jenner. Galway: M ‘ Colla.
There is no species hitherto described with which it is
necessary that this should be compared, the straight and
fusiform frond rendering it clearly distinct from all other recorded
species. This species was named by Mr. Moore Cym.
Hopkirkii, in memory of Mr. Hopkirk, author of “ Flora
Glottiana.”
e. Closteria straight, not lunar.
12. Closterium Trabecula Ehr.
Plate L X X X V I I I . Fig. 3.
Char. Frond broad, longitudinally symmetrical, somewhat
quadrangular. Granules scattered or disposed in several
series. Endochrome fasciated. Bands several.
Closterium Trabecula, Abhandl. der Akademie d. Wissensch.
zu Berlin, 1830, p. 62. 70. ; 1831, p. 68. ; Ehr.
Infus. 93. pi. V. fig. 2. ; Jenner, in Flora of Tunbridge
Wells, p. 196.
Hab. Busthall Common; Piltdown Common; Scrubbs,
Colehrooke Park ; Waterdown Forest: Mr. Jenner.
This Closterium bears some resemblance in form at least to
Cl. margaritaceum, but differs from that species in being
altogether much larger, in its entire margins and in the posi-
B B 4