PLATE CXII. 



Figures magnified 500 diameters. 



Fig. 1. AMPHIPLEURA MAXIMA, W. and Chase, 2, f. 5. Oregon. 



" 2. MELOSIRA ARENARIA, Rah. 2, f. 5, etc. 



" 3. ACTINOPTYCHUS IRREGULARE, V. H., 132, f. 11. 



Figs. 4, 5. MELOSIRA UNDULATA, Slide and S. B., 2, f. 9. 



Fig. 6. COSCINODISOUS DENARIUS, Schtn. At.. 57, f. 24. Atlantic City. 



" 7. TRICERATIUM SUBROTUNDATUM, Sc;hm. At., 93. Atlantic City. 



" 8. COSOINODISCUS MARGINATUS, K. B., 1, f. 7. Amer. 



" 9. STAURONEIS ICOSTAURUM. K. B., 29, f. 10. 



" 10. PHYLLODES, K. B., 29, and Rab., 9. 



" 11. , " LINEATA, K. B., 29, f. 5. 



" 12. AMPHORA FL.EXUOSA, Lens, Vol. 2, No. 2, PL, 1, f. 3. 



" 13. STEPHANODISCUS ASTR^EA, V. H., 95, f. 9, var. minutiala. 



" 14. DISCLOPEA OREGONICA. 



1."). NITZSCHIA BILOBATA, not half but whole frustule. Compare 



Plate 43, f. 5, 6; 8. B. D., Vol. 1, p. 42, PI. 15, f. 



113. 



