. Bulletin of the British Museum (Natural History), Geology. L1- |; â â ;â .; 1- .â¢'â '.' 0 fc* rfl ra ' â 3 â " " * c E 0> (/). Fig. 8 Quantitative analysis of echinoid distribution within the succession at Wilmington. Units a to j are as in Fig. 5 and are drawn proportionally, a, number of specimens collected per unit, b, number of specimens collected per metre of section, c, number of species per unit, d, number of regular and irregular echinoids as a percentage of specimens collected per unit, e, number of regular and irregular echinoid species as a percentage of the number o
. Bulletin of the British Museum (Natural History), Geology. L1- |; â â ;â .; 1- .â¢'â '.' 0 fc* rfl ra ' â 3 â " " * c E 0> (/). Fig. 8 Quantitative analysis of echinoid distribution within the succession at Wilmington. Units a to j are as in Fig. 5 and are drawn proportionally, a, number of specimens collected per unit, b, number of specimens collected per metre of section, c, number of species per unit, d, number of regular and irregular echinoids as a percentage of specimens collected per unit, e, number of regular and irregular echinoid species as a percentage of the number of species per unit, f, number of epifaunal, semi-infaunal and infaunal echinoids as a percentage of specimens per unit, g, number of specimens using specific feeding strategies as a percentage of specimens per unit (a, infaunal bulk sediment swallowers; b, epipsammic grazers; c, epifaunal and semi-infaunal grazers and omnivores; d, epifaunal and semi-infaunal deposit feeders using phyllode tube feet; e, infaunal deposit feeders using phyllode tube feet; f, infaunal deposit feeders using frontal groove to channel sediment down from above). species composition in each unit is quantified in the final section (p. 183) and summarized in Figs 8 and 9. From this a number of general observations can be made. (1) Regular echinoids and primarily epifaunal irregular echinoids (Discoides) are more uni- formly distributed throughout the section than infaunal irregular echinoids. This presumably is because, generally speaking, the nature of the substratum is more crucial to species that live. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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