References

Clark, H. L., 1917. Hawaiian and Other Pacific Echini, 2 Mem. Mus. Comp. Zool., 46 (2), p. 234, Pl. 157.

Fell, H. B., 1958. Deep-Sea Echinoderms of New Zealand. Zool. Pub. Vict. Univ. Wgton., 24.

— 1960. Archibenthal and Littoral Echinoderms of the Chatham Islands. N.Z. Dept. S.I.R. Bull. 139 (2), p. 73, Pl. 10.

Mortensen, Th. , 1951. Monograph of the Echinoidea (Copenhagen), 5 (2), p. 6, et seq., Pls. 1–6.