682 
III. Naturwissenschaft. 
Descriptio. Valvis late lanceolatis apices versus sensim sensimque atte- 
nuatis, apicibus lenissime rostrato paullo sed evidenter productis; margine 
ventrali lenius, dorsuali magis arcuato, raphe paullulo incurva (fere recta), 
zona hyalina tenuissima circa nodulum centralem dilatata cincta, striis trans- 
versis non punctatis radiantibus , 13'5 in 10 p. Long. 33 — 44 p, lat. = 13'2 — 
14-3 p. 
Genus: Encyonema Kütz. [1833], 
22: E. caespitosum Kütz. var. Auersivaldii (Rabenli.) V. Heurck, tab. III, fig. 14. Long. 
= 24 - 2 p’ lat. = 10 p. 
Genus: Amphora Ehrenb. [1831, 1840], 
23. A. ovalis (Breb.) Kütz. V. Heurck, Synop., tab. I, fig. 1. Long. = 46 - 2ju; lat. — 
24 2 p. 
var. gracilis (Ehrenb.) V. Heurck, 1. c., fig. 3. Long. 29 p- lat. — 11 p. 
var. affinis (Kütz.) V. Heurck, 1. c., fig. 2. 
Familie: Groinplionemaceac (Kütz.) Grün. [1860], 
Genus: Gomphonema Ag. [1824], 
24. G. subtile Elirenb. (= G. Sag'itta Schum . f Preussische Diatom., fig. 29 et V. Heurck, 
Synop., tab. XXIII, fig. 27). Long. = 28’6 p-, lat. med. = 66 p-, lat. capit. 
= 4’4 p- lat. stipit. = 2 - 2 p. 
25. G. montanum Schum., Diatom. der Hohen Tatra, p. 67, tab. III, fig. 35 b. 
var. subclavatum Grün, in V. Heurck, Synop., p. 125, tab. XXIII, fig. 43. 
*var. suecicum V. Heurck, 1. c., fig. 32. 
26. G. dichotomum Kütz. V. Heurck, Synop., tab. XXIV, fig. 20. 
27. G. Vibrio Ehrenb, V. Heurck, Synop., tab. XXIV, fig. 26. 
*28. G. mexicanum Grün, in V. Heurck, Synop., tab. XXIV, fig. 3. Long. = 35 p-, 
lat. med. = 6’6 p ; lat. capit. = 4‘4 p; lat. stipit. = 2 2 p; striae 13 - 6 in 10 p. 
Specimina nostra sub apice superiori (capitulo) magis constrictae sunt, 
quam in figura supra citata. 
29. G. olivaceum (Lyngb.) Kütz. (= G. clavatum Ehrenb.) V. Heurck, Synop., tab. 
XXIII, fig. 9. Long. = 26-4—40—44-53 p- lat. med. = 9—11-13-2 p ; lat. 
apic. — 5‘5 — 6‘6 p-, lat. stip. = 3’3 — 4‘4 p. 
Familie: Cocconeidaceae (Kütz.) Grün. [1844], 
Genus: Cocconeis Ehrenb. [1835]. 
30. C. Placentula Ehrenb. var. euglypta (Ehrenb.) V. Heurck, Synop., tab. XXX, fig. 33. 
(sub nomine C. lineata Ehrenb. var. euglypta Grün.) Long. = 18 p-, lat. = 11' p. 
Ord.: Pseudorhaphideae H. L. Smith [1872]. 
Familie: Diatomaceae (Grün.) Kirchn. [1878], 
Genus: Odontidium Kütz. [1844]. 
31. O. mutabile W. Sm. (= Fragilaria mutabilis Grün.) V. Heurck, tab. XLV, fig. 12. 
Long. = 11 p- lat. = 5 p\ striae 9 in 10 p-, lat. later, secundar. = 6 - 6 p. 
