A   B

1).  (A) Hirudocidaris uniformis essensis; Complete test with some articulated primary spines and scrobicular spines (x2.5,  Head Ledge, near Cow Gap, Eastbourne (L. R. Strevens collection), Grey Chalk).  (B).  Complete test of Temnocidaris sceptrifera sceptrifera with a near-complete compliment of primary spines and scrobicular spines.  Some peristomal plating and pedicellariae are also preserved (White Chalk,  Booth Museum BMB 024370, by kind permission of John Cooper).