The Echinoid Directory

• Test small, hemispherical, flattened below, domed above.
• Apical disc small,dicyclic; periproct subovate.
• Ambulacra trigeminate with pore-pairs forming an adradial band and offset as triads; densely packed and uniform from apex to peristome. Plating diadematid with upper and lower elements occluded. Primary tubercle to each triad.
• Interambulacral plates with single relatively large primary tubercle at centre of plate on adapical plates; ambital and subambital plates with 3 adradial and 2 interradial flanking secodaries. Remainder of plate covered with small secondary tubercles and miliaries.
• Primary tubercles small, imperforate and non-crenulate; ambulacral and interambulacral tubercles of similar size.
• Peristome relatively large.
• Spines and lantern unknown.

Lower Cretaceous (Valanginian), France.

Cotteau, G. 1862-1867. Paleontologie francaise. Terrain Cretace 7. Echinides. Victor Masson et fils, Paris.

Desor, E. 1855-1858. Synopsis des échinides fossiles. Reinwald , Paris, lxviii+490 pp., 44 pls.