d. forma cuneata, valvis ovato-lanoeolatis (D, mesodon et /?. Ktz. 1. 1.
D. ouncatum Rabenh. 1. 1. K. 4. Bacillaria cuneata Ehrb. Inf. F. VI.).
e. forma quadrata (Ktz. 1. 1. T. 30. F. 78.).
Hab. per totam Europam.
D. Ehrenbergii Ktz. (Bao. T. 17. F. XVII. 1— 3. Eabenh. Siissw.
Diat. p. 35. T. II. F. 7. Alg. X. 601. Desmaz. ed. nov. X. 102.
Bad. X. 4. Wart. X. 128. Pritoh. Inf. T. IV. F. 15. Bacillaria elongata
Ehrb. Inf. p. 198. X. 272. T. XV. F. V. Gloeonema Houflcri
Menegh. Linnaea. Diat. elongatum var. )i. Sm. p. 40. F. 811. (Ì.
Babenh. Alg. sub Xo. 1063.). D. lineare polos versus paulum dila-
tatum, valvis linearibus sub polis oonstriotis, apicibus c ap ita tis , rotundatis
; costis 12—24 in 0,001".
Long. V%— V-i«'" = 0,0009—0,0045".
h. forma intermedia, frustula u t fere in forma typioa, sed valvae
sub polis vix constrictae et apices subouneatim obtnsiusculi.
c. forma grandis, valvis exaote linearibus, utroque fine capitato-
constrictis et late rotundatis (Diat. grande Sm. 1. 1. F. 310.).
Hab. in aquis dulcibus totius Europae.
D. elongatum Ag. (Syst. p. 4. Ktz. Bao. p. 48. T. 17. F. XVIII.
1 ct 2. Rabenh. Siissw. Diat. 1. 1. P. 1. Alg. X. 704. West. X. 799.
Sm. Diat. T. XL. F. 311. exol. var. /?. Heib. Consp. 57. Diat. gra-
oillimum Xiigel. in Ktz. Spec. Alg. p. 8 8 8 .). D. frustulis fronte bacil-
laribus utroque fine in capitulum tumidulis (non constrictis); costis 18
in 0 ,0 0 1 ". V. V.
Long. 1/70— V20" ' = 0,0012— 0,0045".
b. abbreviatum, forma brevis '/iso— '/lo '" longa (D. elong. var. y,
Sm. 1. 1. Babenh. Alg. X. 1492. (purum!)
Hab. in aquis duloibus et salsis per totam Europam.
D. tenue Ag. (Consp. p. 52. Ktz. Bao. p. 48. T. 17. F. X. 6— 14.
Alg. exs. aq. dulo. X. 26. Lyngb. Hydr. danic. T. 61. Babenh. Siissw.
Diat. p. 56. T. IV. E. 1. Alg. sub Xo. 701. Bacillaria pectinalis
Ebrb. Inf. p. 198. T. XV. F. IV.). D. gracile, lineare, plus minus
tabellatnm, cuneatum vel quadratum, valvis anguste lanoeolatis, apicibus
obtusis parum productis, striis 10— 16 in 0,001". v. v.
Long, admodum variabilis, '/ 270— 7'*^'" “ 0,0003-—0,0018".
Hab. praecipue in rivulis, fossis, fluviis totius Europae.
b. Striis transversis aegre conspicuis: Fragilaria fasciis solutis
diatomaceis.
D. hyalinum Ktz. (Bae. p. 47. T. 17. F. XX. Sm. Diat. I I .
p. 41. T. XLI. F. 312. Pritoh. Inf. p. 778. T. IV. F. 16.). D.
fronte lineari - elliptioum vel lanceolatum, utroque fine acutiuscu-
lum. V. V.
Long. V102— '/ i s '" = 0,0008—0,0052",
h. forma minor, '/n o '" longa. (D. vitreum Ktz. 1. L).
e. forma minima, '/s42 — '/ 205'" longa. ( b . minimum Ealfs in
Trans. Bot. Soo. of Edinb. I I . p. 20. Sm. 1. 1. F. 813.).
Hab. in algis marinis ad oras Europae.
XSlXI I. Dimeregramma Pritch. ( I 8 6 I ) : Frustula
quadrangula in fasoias arcte oonjuncta, snb polis constricta; valvae undulatae,
transverse s tria ta e , nodulo centrali destitutae ; striis medio vitta
vel area longitudinali interruptis. Conf. Fig. nostr. 36.
(Dentioulae spec. Gregory ex parte),
a. Frustula latere medio dilatata, sub polis constricta.
D. minor Pritch. (Inf. 790. Grun. in Wien. Verh. 1862. p. 376.
T. VII. F. 29. Denticula minor Greg. Diat. of the Clyde p. 22. T. I I .
F. 35.). D. parvum, pauca in fasoias oonjuncta, valvis anguste rhombco-
lanoeolatis, costis 15—20 in 0 ,0 0 1 ".
Long. '/i48'" = 0,0005".
Hab. in Lamlash Bay et Loch Fine Sootiae (Gregory), in fundo
maris adriatioi (Lorenz).
D. capitatum Pritch. (1. 1. Denticula capitata Greg. 1. 1. F. 31.).
D. robustum, apicibus rotundatis, valvis late laneeolatis, apicibus obtusis,
striis subtilibus 19— 24 in 0,001". v. s.
Long. 1/50— '/s s '" = 0,0017— 0 ,0 0 2 3 " ; lat. max. '/i63'" = 0,00058".
Hab. in Loch Fine Sootiae, Cap Martin prope Mentone (Boettcher).
D. nanum Pritch. (1. 1. T. IV. F. 33. D. Gregoriana Grun. 1. 1.
T. VII. P. 21— 23. Denticula nana Greg, Diat. of the Clyde p. 23.
T. I I . F. 34.). D. minor, medio iniiatum, apicibus dilatatüm; valvis
ovalibus, polos versus subito a ttenuatis; striis 24— 80 in 0 ,0 0 1 ". v. s.
Long, variaf: '/is i— '/ 122'" = 0,00048— 0,00073".
Hab. ad oras Sootiae (Gregory), Hiberniae, in arena litorali maris
Adriatioi (Lorenz), in limo maritimo maris mediterranei „Cap Martin“
(Böttcher); in algis marinis „Cap S. Andrea" prope Genuam (Piccone).
D. distans Pritch. (1. 1. T. IV. F. 34. Denticula distans Greg.
1. 1. F. 36.). D. major, robustum, valvis late laneeolatis, apicibus
obtuso-rotundatis; striis validissimis, brevissimis, remotis, 1 0 in 0 ,0 0 1 ",
area late lanceolata, percursa laevissima. v. s.
Long. '/ 50— '/ 32'" = 0,00177—0,00275".
Hab. ad oras Sootiae, in Tago salso, in arena litorali maris Adriatici
(Lorenz), ad Venetiam, in algis m ajoribus'ex portu Plymouth (herbar. Suhr).