The Diatomaceæ of Philadelphia and Vicinity

by Charles S. Boyer

Fig.		Page
1	Nitzschia spectabilis var. americana Grun. (zone view)	[122]
2	Nitzschia panduriformis Greg.	[117]
3	Hantzschia amphioxys (Ehr.) Grun.	[113]
4	Hantzschia amphioxys var. major Grun.	[114]
5	Nitzschia dubia Wm. Sm.	[118]
6	Nitzschia amphioxys Wm. Sm.	[114]
7	Nitzschia compressa (Bail.)	[116]
8	Nitzschia compressa var. minor H. L. Smith	[116]
9	Surirella intermedia Lewis (zone view)	[128]
10	Surirella arctissima A. S. forma minor	[128]
11	Surirella ovalis Bréb.	[126]
12	Surirella biseriata (Ehr.) Bréb.	[124]
13	Nitzschia sigma (Kuetz.) Wm. Sm.	[121]
14	Nitzschia obtusa var. flexella H. L. Smith	[121]
15	Stauroneis legumen Ehr.	[89]
16	Nitzschia obtusa Wm. Sm.	[121]

PLATE 40

Fig. Page 1 Caloneis liber (Wm. Sm.) Cl. [81] 2 Anomœoneis sphærophora (Kuetz.) Cl. [80] 3 Nitzschia spathulata Bréb. [120] 4 Stauroneis ? abnormal [89] 5 Navicula ? abnormal [101] 6 Podocystis adriatica Kuetz. [129] 7 Nitzschia dissipata (Kuetz.) Grun. [120] 8 Cymbella ventricosa Kuetz. (zone view) [62] 9 Navicula radiosa Kuetz. (zone view) [94] 10 Detail of Rhabdonema arcuatum (Lyng.) Kuetz. [35] 11 Diatoma anceps (Ehr.) Kirchn. (containing chromataphores) [42] 12 Coscinodiscus asteromphalus Ehr. (trans. section, after Pelletan) [23] 13-14-15 Transverse section (diagram) of Pinnularia showing straight, oblique and grooved raphes [101] 16 Transverse section (diagram) of Biddulphia favus showing inner punctate stratum (after Deby) [31] 17 Transverse (ideal) section of Surirella [124] 18-19 Transverse (ideal) section of Pinnularia, before and after division [101] 20 Transverse section of Nitzschia linearis (Ag.) Wm. Sm. [122] 21 Transverse section (diagram) of Navicula [89] 22 Transverse section (diagram) of Cymbella [60] 23 Transverse section (diagram) of Amphora [65]

Fig.		Page
1	Caloneis liber (Wm. Sm.) Cl.	[81]
2	Anomœoneis sphærophora (Kuetz.) Cl.	[80]
3	Nitzschia spathulata Bréb.	[120]
4	Stauroneis ? abnormal	[89]
5	Navicula ? abnormal	[101]
6	Podocystis adriatica Kuetz.	[129]
7	Nitzschia dissipata (Kuetz.) Grun.	[120]
8	Cymbella ventricosa Kuetz. (zone view)	[62]
9	Navicula radiosa Kuetz. (zone view)	[94]
10	Detail of Rhabdonema arcuatum (Lyng.) Kuetz.	[35]
11	Diatoma anceps (Ehr.) Kirchn. (containing chromataphores)	[42]
12	Coscinodiscus asteromphalus Ehr. (trans. section, after Pelletan)	[23]
13-14-15	Transverse section (diagram) of Pinnularia showing straight, oblique and grooved raphes	[101]
16	Transverse section (diagram) of Biddulphia favus showing inner punctate stratum (after Deby)	[31]
17	Transverse (ideal) section of Surirella	[124]
18-19	Transverse (ideal) section of Pinnularia, before and after division	[101]
20	Transverse section of Nitzschia linearis (Ag.) Wm. Sm.	[122]
21	Transverse section (diagram) of Navicula	[89]
22	Transverse section (diagram) of Cymbella	[60]
23	Transverse section (diagram) of Amphora	[65]