A very common and important echinoid throughout the White Chalk above the Terebratulina lata zone. This species has a highly variable form, both of shape and adult size, that has great application to biostratigraphy (i.e. the various forms can be used to recognise specific horizons in the Chalk).
A B C
1). Echinocorys scutata (x1.5, Newhaven Chalk Formation, Peacehaven, Randell Collection, RR0556). (A) Apical (upper) surface, anterior (front) end at the bottom of the image. (B) Lateral (side) view, anterior end at left of image. (C) Oral (under) surface, anterior end at the bottom of the image. The lower opening is the peristome whilst he posterior opening (top of image) is the periproct.
2). Lateral views of a variety of specimens showing variable profiles, from various horizons and localities. Specimens on the left have flint projections (x0.7, Newhaven Chalk Formation, Sussex and Hampshire). All Randell Collection, (A) RR0122, (B-D) RR0556, (E) RR1006, (F) RR0556, (G) RR0122, (H) RR0641.