i
Closterium striolatum, Abhandl. der Akademie d. Wissensch.
zu Berlin, 1831, p. 68. ; 1833, p. 238. Closterium cos-
tatum ! and CL spirale Corda, Almanac de Carlsbad,
1835, p. 191. taf. Y. f. 61—63. and fig. 6 7 .? ; Ehr. In fus.
p. 96. taf. 6. fig. 12. ; Jenner, 1. c. p. 196.
Hab. Several places in Sussex and Kent : Mr. Jenner.
Hertford Heath : A. H. H. Aberdeen : Dr. Dickie.
Galway: AI‘Colla.
This is a smaller species, more attenuated at the extremities,
and with striæ more evident than in Closterium turgidum.
Each segment is occasionally divided by a transverse
line, as is well represented in one of the figures given by
Ehrenberg.
6. Closterium lineatum Ehr.
Plate L X X X V I I I . Eig. 1.
Char. Frond very long, slender, slightly curved, in the centre
cylindrical and filiform, much attenuated at each extremitg,
distinctly striated, often twenty times as long as
broad.
Closterium lineatum, Abhandl. der Akademie d. Wissensch.
zu Berlin, 1833 (1832), p. 238. ; Ehr. Infus. p. 96. t. 6.
fig. 8. ; Jenner, in Flora of Tunbridge Wells, p. 196.
Hab. Ashdown Forest: Mr. Jenner.
This is one of the most striking species of the genus ; the
granules are often arranged in single series, but sometimes
they are scattered.
7. Closterium Cornu Ehr.
Plate L X X X V I I I . Fig. 2.
Char. Frond small, very slender, subcylindrical, slightly
curved. Endochrome undulated.
Vibrio Lunula Müller, Animale. Infus. tab. vii. fig. 8. ?
Closterium Cornu, Abhandl. der Akademie d. W^issensch.
zu Berlin, 1830, p. 62.; 1831, p. 67. Closterium tenue
Kützing, Synopsis Diatom, in v. Schlechtendal’s L in næa,
p. 595. tafel xviii. f. 78. ; Ehr. Infus. p. 94. taf. vi.
fig. 5. ; Jenner, in Flora of Tunbridge Wells, p. 196.
Hab. Piltdown Common: Air. Jenner.
Apparently a very distinct little species.
C. Closteria appendaged, curved, striated.
8. Closterium rostratum Ehr.
Plate L X X X V I I . Fig. 6.
Char. Closterium fusiform, slender, slightly curved, striated,
much attenuated, appendaged, each horn scarcely equalling
the body in length, often much shorter.
Closterium rostratum, Abhandl. der Akademie d. Wissensch.
zu Berlin, 1831, p. 67. ; 1833, p. 240. Lrustulia
subtilis and subulata Kützing? Synops. Desmid. p. 538.
taf. xiii. fig. 3., 1833. Closterium caudatum Corda, Almanac
de Carlsbad, p. 190. 209. tafel v. fig. 66., 1835 ;
Jenner, 1. c. p. 196.
Hab. Heathfield; Warbleton; Waterdown Forest, &c. :
Mr. Jenner. High Beech : A. II. H.
A singular but not uncommon species.
9. Closterium setaceum Ehr.
Plate L X X X V I I . Fig. 7.
Char. Frond fusiform, setaceous, straight, or very slightly
curved, fa in tly striated, appendaged, appendages longer
than the fro n d itself.
Closterium setaceum, Abhandl. der Akad. d. Wissensch.
zu Berlin, 1833, p. 239.; Jenner, in loc. cit. p. 196.
Hab. Waterdown Forest, and near Cross in H an d : Mr.
Jenner. Cheshunt Common : A. H. II.
B B 3