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| Fig. | Page | |
| MERIDION | ||
| 1-2-3 | Meridion circulare (Grev.) Ag. | 40 |
| DIATOMA | ||
| 4 | Diatoma vulgare var. grande (Wm. Sm.) Grun. | 42 |
| 5-6 | Diatoma anceps (Ehr.) Kirchn. | 42 |
| 7-8 | Diatoma hiemale (Lyng.) Heib. | 42 |
| 9-10 | Diatoma vulgare Bory. | 42 |
| PLAGIOGRAMMA | ||
| 11 | Plagiogramma tessellatum Grev. | 43 |
| 12 | Plagiogramma obesum Grev. | 43 |
| 13 | Plagiogramma pygmæum Grev. | 43 |
| 14 | Plagiogramma wallichianum Grev. | 43 |
| EUNOTOGRAMMA | ||
| 15 | Eunotogramma læve Grun. | 33 |
| OPEPHORA | ||
| 16-19 | Opephora schwartzii (Grun.) Petit. | 43 |
| 17 | Opephora pinnata var. lanceolata n. var. | 44 |
| 18 | Opephora pacifica (Grun.) Petit. | 43 |
| FRAGILARIA | ||
| 20-21 | Fragilaria virescens Ralfs. | 44 |
| 22-23 | Fragilaria arctica Grun. | 44 |
| 24-25-27-28-29 | Fragilaria undata Wm. Sm. | 44 |
| 26 | Fragilaria undata Wm. Sm., var.? | 44 |
| 30 | Fragilaria construens (Ehr.) Grun. | 45 |
| 31 | Fragilaria harrisonii (Wm. Sm.) Grun. | 45 |
| 34 | Fragilaria capucina var. mesolepta Rab. | 45 |
| 35 | Fragilaria parasitica (Wm. Sm.) | 45 |
| 36 | Fragilaria sp. ? | 45 |
| 37 | Fragilaria linearis Cstr. | 45 |
| RHAPHONEIS | ||
| 38 | Rhaphoneis amphiceros Ehr. | 46 |
| 39-40 | Rhaphoneis amphiceros var. rhombica Grun. | 46 |
| 41 | Rhaphoneis belgica var. intermedia Grun. | 46 |
| SYNEDRA | ||
| 32-33 | Synedra radians Kuetz. | 49 |
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| Fig. | Page | |
| SYNEDRA—Continued | ||
| 1-5-6 | Synedra ulna (Nitzsch) Ehr. Sporangial | 47 |
| 2 | Synedra danica Kuetz. | 48 |
| 3 | Synedra biceps (Kuetz.) A. S. | 48 |
| 4-7-11 | Synedra ulna (Nitzsch) Ehr. | 47 |
| 8 | Synedra capitata Ehr. | 48 |
| 9-18 | Synedra acus Kuetz. | 48 |
| 10 | Synedra fulgens (Grev.) Wm. Sm. | 50 |
| 12-13 | Synedra goulardi Bréb. | 48 |
| 14-15-16 | Synedra pulchella (Ralfs) Kuetz. | 48 |
| 17 | Synedra pulchella var. abnormis Macchiati? | 48 |
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| Fig. | Page | |
| SYNEDRA—Continued | ||
| 1 | Synedra oxyrhynchus var. undulata Grun. | 48 |
| 2 | Synedra pulchella var. flexella n. var. | 49 |
| 3 | Synedra affinis Kuetz. | 50 |
| 4 | Synedra affinis var. tabulata (Ag.) V. H. | 50 |
| 5-6 | Synedra vaucheriæ var. parvula (Kuetz.) Rab. | 49 |
| 7 | Synedra affinis var. parva (Kuetz.) V. H. | 50 |
| 8 | Synedra radians (Kuetz.) H. L. S. | 49 |
| DIMEROGRAMMA | ||
| 9-10 | Dimerogramma marinum (Greg.) | 46 |
| 11 | Dimerogramma surirella (Ehr.) Grun. | 46 |
| 12-13-14 | Dimerogramma minus (Greg.) Ralfs. | 47 |
| TRACHYSPHENIA | ||
| 15 | Trachysphenia australis Petit. | 47 |
| ACTINELLA | ||
| 16-17-18 | Actinella punctata Lewis. | 54 |
| ASTERIONELLA | ||
| 19-20-21 | Asterionella formosa Hass. | 50 |
| 22 | Asterionella inflata Heib. | 50 |
| EUNOTIA | ||
| 23 | Eunotia hemicyclus (Ehr.) Ralfs | 53 |
| 24-25 | Eunotia lunaris (Ehr.) Grun. | 53 |
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| Fig. | Page | |
| EUNOTIA—Continued | ||
| 1-2 | Eunotia major (Wm. Sm.) Rab. | 51 |
| 3 | Eunotia gracilis (Ehr.) Rab. | 51 |
| 4 | Eunotia major (Wm. Sm.) Rab. (intermediate form) | 51 |
| 5 | Eunotia prærupta Ehr. | 53 |
| 6-7 | Eunotia pectinalis (Kuetz.) | 52 |
| 8-10 | Eunotia pectinalis var. undulata Ralfs | 52 |
| 9 | Eunotia pectinalis var. solierolii (Kuetz.) | 52 |
| 11 | Eunotia luna Ehr. var.? | 52 |
| 12 | Eunotia pectinalis var. ventricosa Grun. | 52 |
| 13 | Eunotia robusta Ralfs (E. scalaris Ehr.) | 53 |
| 14 | Eunotia robusta Ralfs (E. prioritis Ehr.) | 53 |
| 15 | Eunotia robusta Ralfs (E. decadon Ehr.) | 53 |
| 16 | Eunotia robusta Ralfs (E. octodon Ehr.) | 53 |
| 17-22 | Eunotia robusta Ralfs (E. heptodon Ehr.) | 53 |
| 18 | Eunotia bactriana Ehr. | 54 |
| 19 | Eunotia prærupta var. bidens Grun. | 53 |
| 20 | Eunotia bidentula Wm. Sm. | 54 |
| 21 | Eunotia robusta Ralfs (E. diadema Ehr.) | 53 |
| 23 | Eunotia prærupta Ehr. var.? | 53 |
| 24 | Eunotia robusta Ralfs (E. triodon Ehr.) | 53 |
| 25 | Eunotia robusta Ralfs (E. tetraodon Ehr.) | 53 |
| 26 | Eunotia formica Ehr. var.? | 54 |
| 27 | Eunotia biceps Ehr. | 53 |
| 28-29 | Eunotia sp.? | 54 |
| 30-31 | Eunotia veneris Kuetz. | 52 |
| 32 | Eunotia nymanniana Grun. | 51 |
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| Fig. | Page | |
| AMPHIPRORA | ||
| 1-2 | Amphiprora pulchra Bail. | 68 |
| 3 | Amphiprora alata Kuetz. | 68 |
| 4 | Amphiprora conspicua Grev. | 68 |
| 5 | Amphiprora paludosa Wm. Sm. | 68 |
| 6-7 | Amphiprora ornata Bail. | 68 |
| TROPIDONEIS | ||
| 8-9 | Tropidoneis lepidoptera (Greg.) Cleve. | 69 |
| SCOLIOTROPIS | ||
| 10-11 | Scoliotropis latestriata var. amphora Cleve. | 69 |
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| Fig. | Page | |
| AMPHORA | ||
| 1 | Amphora robusta Greg. | 65 |
| 3 | Amphora crassa Greg. | 65 |
| 4 | Amphora obtusa Greg. | 67 |
| 5-6-19 | Amphora proteus Greg. | 65 |
| 7 | Amphora ovalis (Bréb.) Kuetz. | 65 |
| 8-18 | Amphora coffæiformis (Ag.) Kuetz. | 66 |
| 9-10 | Amphora lineolata Ehr. | 66 |
| 11 | Amphora areolata Grun. | 66 |
| 12-21 | Amphora ostrearia Bréb. | 66 |
| 13 | Amphora lævis Greg. | 66 |
| 14-15 | Amphora ocellata var. cingulata Cleve. | 67 |
| 16 | Amphora angusta var. culensteinii Grun. | 67 |
| 17 | Amphora arenaria Donk. | 67 |
| 20 | Amphora acuta Greg. | 66 |
| AURICULA | ||
| 2 | Auricula mucronata (H. L. Smith) Peragallo | 69 |