Charles S. Boyer

“ Kuetz. 20 8 Cyclotella meneghiniana Kuetz. 19 9 Cyclotella striata (Kuetz.) Grun. 19 10 Cyclotella stylorum (Br.?) V. H. 20 11 Cyclotella antiqua Wm. Sm. 20 12 Cyclotella meneghiniana var. stellulifera Cl. and Grun. 20 COSCINODISCUS 13 Coscinodiscus denarius A. S. 22 14 Coscinodiscus excentricus Ehr. 21 15-17 Coscinodiscus subtilis Ehr. 21 16 Coscinodiscus asteromphalus Ehr. 23 18 Coscinodiscus nitidus Greg. 21 19 Coscinodiscus nitidulus Grun. 21 20 Coscinodiscus excentricus var. perpusilla Grun. ? 21
PLATE 3
Fig. Page COSCINODISCUS—Continued 1-11 Coscinodiscus radiatus Ehr. ”

“ Sm.) Ralfs 29 6 Auliscus punctatus Bail. 28 7 Auliscus (intermediate form between A. cælatus and A. sculptus) 29 8 Auliscus pruinosus Bail. 28 PSEUDAULISCUS 9 Pseudauliscus radiatus (Bail.) Rattr. 29 10 Pseudauliscus spinosus (Christian) Rattr. 29
PLATE 6
Fig. Page ACTINOCYCLUS 1 Actinocyclus barkleyi var. aggregata Rattr. 27 2 Actinocyclus moniliformis Ralfs. 27 BIDDULPHIA 3 Biddulphia antediluviana (Ehr.) ”