| Fig. | | Page | | GOMPHONEIS | | 1 | Gomphoneis mamilla (Ehr.) Cl. | 70 | | 2 | Gomphoneis herculaneum (Ehr.) Cl. | 70 | | GOMPHONEMA | | 3 | Gomphonema montanum Schum. | 71 | | 4 | Gomphonema geminatum Lyng. | 71 | | 5 | Gomphonema acuminatum var. turris (Ehr.) Cl. | 71 | | 6-12 | Gomphonema lanceolatum var. insignis (Greg.) Cl. | 71 | | 7 | Gomphonema acuminatum var. coronata (Ehr.) Cl. | 71 | | 8 | Gomphonema constrictum Ehr. | 72 | | 9-10 | Gomphonema sphÆrophorum Ehr. | 72 | | 11 | Gomphonema acuminatum var. turris (Ehr.) Cl.? | 71 | | 13 | Gomphonema ventricosum Greg. | 73 | | 14 | Gomphonema intricatum Kuetz. | 72 | | 15 | Gomphonema Æquale Greg. | 72 | | 16 | Gomphonema sarcophagus Greg. | 72 | | 17 | Gomphonema parvulum var. micropus (Kuetz.) Cl. | 73 | | 18-19 | Gomphonema angustatum Kuetz. | 72 | | 20 | Gomphonema acuminatum var. trigonocephala (Ehr.) Cl. | 71 | | 21 | Gomphonema augur Ehr. | 72 | | 22 | Gomphonema capitatum Ehr. | 72 | | 23 | Gomphonema olivaceum Lyng. | 73 | | 24 | Gomphonema brasiliense var. demerarÆ Grun.? | 73 | | RHOICOSPHENIA | | 25-26-27 | Rhoicosphenia curvata (Kuetz.) Grun. | 56 | | | | Fig. | | Page | | GOMPHONEIS | | 1 | Gomphoneis mamilla (Ehr.) Cl. | 70 | | 2 | Gomphoneis herculaneum (Ehr.) Cl. | 70 | | GOMPHONEMA | | 3 | Gomphonema montanum Schum. | 71 | | 4 | Gomphonema geminatum Lyng. | 71 | | 5 | Gomphonema acuminatum var. turris (Ehr.) Cl. | 71 | | 6-12 | Gomphonema lanceolatum var. insignis (Greg.) Cl. | 71 | | 7 | Gomphonema acuminatum var. coronata (Ehr.) Cl. | 71 | | 8 | Gomphonema constrictum Ehr. | 72 | | 9-10 | Gomphonema sphÆrophorum Ehr. | 72 | | 11 | Gomphonema acuminatum var. turris (Ehr.) Cl.? | 71 | | 13 | Gomphonema ventricosum Greg. | 73 | | 14 | Gomphonema intricatum Kuetz. | 72 | | 15 | Gomphonema Æquale Greg. | 72 | | 16 | Gomphonema sarcophagus Greg. | 72 | | 17 | Gomphonema parvulum var. micropus (Kuetz.) Cl. | 73 | | 18-19 | Gomphonema angustatum Kue
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