The Diatomaceæ of Philadelphia and Vicinity

by Charles S. Boyer

Fig. Page SURIRELLA—Continued 1 Surirella elegans Ehr. [125] 2 Surirella robusta Ehr. [124] 3 Surirella febigerii Lewis [128] 4 Surirella gemma Ehr. [125] 5 Surirella guatimalensis Ehr. [126] 6 Surirella panduriformis Wm. Sm. [126] 7-9 Surirella pinnata Wm. Sm. [126] 8 Surirella angusta Kuetz. [127]

Fig.		Page
SURIRELLA—Continued
1	Surirella elegans Ehr.	[125]
2	Surirella robusta Ehr.	[124]
3	Surirella febigerii Lewis	[128]
4	Surirella gemma Ehr.	[125]
5	Surirella guatimalensis Ehr.	[126]
6	Surirella panduriformis Wm. Sm.	[126]
7-9	Surirella pinnata Wm. Sm.	[126]
8	Surirella angusta Kuetz.	[127]

PLATE 37

Fig. Page CYMATOPLEURA 1 Cymatopleura elliptica (Bréb.) Wm. Sm. [129] 2 Cymatopleura elliptica forma spiralis [129] 3-4 Cymatopleura marina Lewis [129] CAMPYLODISCUS 5 Campylodiscus hibernicus Ehr. [130] 6 Campylodiscus echeneis Ehr. [130]

Fig.		Page
CYMATOPLEURA
1	Cymatopleura elliptica (Bréb.) Wm. Sm.	[129]
2	Cymatopleura elliptica forma spiralis	[129]
3-4	Cymatopleura marina Lewis	[129]
CAMPYLODISCUS
5	Campylodiscus hibernicus Ehr.	[130]
6	Campylodiscus echeneis Ehr.	[130]

PLATE 38

Fig. Page 1 Amphora gigantea var. fusca A. S. [65] 2 Meloseira crenulata (Ehr.) Kuetz. [15] 3-4 Licmophora baileyi (Edw.) Grun. [40] 5 Coscinodiscus polyacanthus Grun. [22] 6-7 Ditylum intricatum (West) Grun. [30] 8 Pyxidicula cruciata Ehr. [19] 9 Gyrosigma scalproides (Rab.) Cl. [76] 10 Coscinodiscus asteromphalus var. omphalantha (Ehr.) Grun. [23] 11 Rhabdonema minutum Kuetz. [36] 12 Gyrosigma kuetzingii (Grun.) Cl. [76] 13 Gyrosigma prolongatum (Wm. Sm.) Cl. [76] 14 Cymbella parva (Wm. Sm.) Cl. [61] 15 Gomphoneis herculaneum (Ehr.) Cl. (zone view) [70] 16 Cymbella ventricosa Kuetz. [62] 17-18 Eunotia sp. (abnormal?) [54]

Fig.		Page
1	Amphora gigantea var. fusca A. S.	[65]
2	Meloseira crenulata (Ehr.) Kuetz.	[15]
3-4	Licmophora baileyi (Edw.) Grun.	[40]
5	Coscinodiscus polyacanthus Grun.	[22]
6-7	Ditylum intricatum (West) Grun.	[30]
8	Pyxidicula cruciata Ehr.	[19]
9	Gyrosigma scalproides (Rab.) Cl.	[76]
10	Coscinodiscus asteromphalus var. omphalantha (Ehr.) Grun.	[23]
11	Rhabdonema minutum Kuetz.	[36]
12	Gyrosigma kuetzingii (Grun.) Cl.	[76]
13	Gyrosigma prolongatum (Wm. Sm.) Cl.	[76]
14	Cymbella parva (Wm. Sm.) Cl.	[61]
15	Gomphoneis herculaneum (Ehr.) Cl. (zone view)	[70]
16	Cymbella ventricosa Kuetz.	[62]
17-18	Eunotia sp. (abnormal?)	[54]

PLATE 39

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]