15 Eunotia robusta Ralfs (E. decadon Ehr.) 53 16 Eunotia robusta Ralfs (E. octodon Ehr.) 53 17-22 Eunotia robusta Ralfs (E. heptodon Ehr.) 53 18 Eunotia bactriana Ehr. 54 19 Eunotia prærupta var. bidens Grun. 53 20 Eunotia bidentula Wm. Sm. 54 21 Eunotia robusta Ralfs (E. diadema Ehr.) 53 23 Eunotia prærupta Ehr. var.? 53 24 Eunotia robusta Ralfs (E. triodon Ehr.) 53 25 Eunotia robusta Ralfs (E. tetraodon Ehr.) 53 26 Eunotia formica Ehr. var.? 54 27 Eunotia biceps Ehr. 53 28-29 Eunotia sp.? 54 30-31 Eunotia veneris Kuetz. 52 32 Eunotia nymanniana Grun. 51 [Illustration: PLATE 13] PLATE 14 AMPHIPRORA 1-2 Amphiprora pulchra Bail. 68 3 Amphiprora alata Kuetz. 68 4 Amphiprora conspicua Grev. 68 5 Amphiprora paludosa Wm. Sm. 68 6-7 Amphiprora ornata Bail. 68 TROPIDONEIS 8-9 Tropidoneis lepidoptera (Greg.) Cleve. 69 SCOLIOTROPIS 10-11 Scoliotropis latestriata var. amphora Cleve. 69 [Illustration: PLATE 14] PLATE 15 AMPHORA 1 Amphora robusta Greg. 65 3 Amphora crassa Greg. 65 4 Amphora obtusa Greg. 67 5-6-19 Amphora proteus Greg. 65 7 Amphora ovalis (Bréb.) Kuetz. 65 8-18 Amphora coffæiformis (Ag.) Kuetz. 66 9-10 Amphora lineolata Ehr. 66 11 Amphora areolata Grun. 66 12-21 Amphora ostrearia Bréb. 66 13 Amphora lævis Greg. 66 14-15 Amphora ocellata var. cingulata Cleve. 67 16 Amphora angusta var. culensteinii Grun. 67 17 Amphora arenaria Donk. 67 20 Amphora acuta Greg. 66 AURICULA