The Diatomaceæ of Philadelphia and Vicinity

PLATE 10

Reading edition

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

Illustration from The Diatomaceæ of Philadelphia and Vicinity

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