The Diatomaceæ of Philadelphia and Vicinity

PLATE 16

Reading edition

Fig. Page ACHNANTHES 1-2 Achnanthes longipes Ag. 58 3 Achnanthes brevipes Ag. 59 4-5-6 Achnanthes subsessilis Kuetz. 59 7-8 Achnanthes inflata (Kuetz.) Grun. 59 9 Achnanthes coarctata (Bréb.) Grun. 59 10-11-12 Achnanthes lanceolata (Bréb.) Grun. 59 13 Achnanthes danica (Floegel) Grun. (lower valve) 60 14-15 Achnanthes exigua Grun. 59 16-17 Achnanthes linearis forma curta H. L. Smith 59 COCCONEIS 18 Cocconeis scutellum var.? 57 19-20 Cocconeis placentula Ehr. 57 21 Cocconeis scutellum Ehr. (upper valve) 57 22 Cocconeis dirupta Greg. (lower valve) 58 23-24 Cocconeis pediculus Ehr. 57 25-26 Cocconeis pellucida Grun. 58 27-28 Cocconeis scutellum var. ornata Grun. 57 29 Cocconeis placentula var. lineata (Ehr.) V. H. 58 ANORTHONEIS 30-31 Anorthoneis excentrica (Donk.) Grun. 56

Illustration from The Diatomaceæ of Philadelphia and Vicinity

Fig. Page

ACHNANTHES

1-2 Achnanthes longipes Ag. 58

3 Achnanthes brevipes Ag. 59

4-5-6 Achnanthes subsessilis Kuetz. 59

7-8 Achnanthes inflata (Kuetz.) Grun. 59

9 Achnanthes coarctata (Bréb.) Grun. 59

10-11-12 Achnanthes lanceolata (Bréb.) Grun. 59

13 Achnanthes danica (Floegel) Grun. (lower valve) 60

14-15 Achnanthes exigua Grun. 59

16-17 Achnanthes linearis forma curta H. L. Smith 59

COCCONEIS

18 Cocconeis scutellum var.? 57

19-20 Cocconeis placentula Ehr. 57

21 Cocconeis scutellum Ehr. (upper valve) 57

22 Cocconeis dirupta Greg. (lower valve) 58

23-24 Cocconeis pediculus Ehr. 57

25-26 Cocconeis pellucida Grun. 58

27-28 Cocconeis scutellum var. ornata Grun. 57

29 Cocconeis placentula var. lineata (Ehr.) V. H. 58

ANORTHONEIS

30-31 Anorthoneis excentrica (Donk.) Grun. 56