Plate P6. Discoasteraceae III. Taxonomic organization and concepts are generally comparable to those of Young and Bown (1997) and Young (1998). Images with black background are cross-polarized light images; those with light backgrounds are phase-contrast images. 1–6. Discoaster asymmetricus; (1, 3–6) Sample 198-1208A-18H-CC, (2) Sample 198-1208A-21X-CC. 7–10. Discoaster tamalis; (7, 9) Sample 198-1208A-15H-CC, (8) Sample 198-1208A-16H-CC. 10. Discoaster ?blackstockiae (Sample 198-1208A-21X-CC). 11, 12. Discoaster triradiatus; (11) Sample 198-1208A-28X-CC, (12) Sample 198-1208A-24X-CC. 13–18. Discoaster bellus (Sample 198-1208A-29X-CC). 19–23. Discoaster hamatus; (19, 20, 22, 23) Sample 198-1208A-29X-CC, (21) Sample 198-1208A-30X-CC. 24–34. Discoaster berggrenii; (24, 25) Sample 198-1208A-26X-CC, (26, 27) Sample 198-1208A-25X-CC, (28, 29, 33, 34) Sample 198-1208A-27X-CC, (30–32) Sample 198-1208A-27X-5. 35–41. Discoaster quinqueramus; (35, 40, 41) Sample 198-1208A-26X-CC, (36, 37) Sample 198-1208A-29X-CC, (38, 39) Sample 198-1208A-25X-CC. (