Stauranderaster squamatus (Forbes)
A scarce form of Stauranderaster from the White Chalk, whose primary interadial and centro-dorsal ossicles posses a flared and gently notched base and a cap-like summit. The disc is domed, with a small and constricted crown.
1). Aboral view of a unique well-preserved specimen (x2.3, White Chalk, 'Woolwich', Greater London, Willett Collection, Booth Museum, BMB 007806, by kind permission of John Cooper).
2). Details of the above specimen; (A) a very well preserved crown of primary interadial and centro-dorsal ossicles (x5); (B) the madreporite and its associated primary interadial (x8).
3). Aboral surface of an arm from the above specimen (x6).