Conolampas is very similar to Hypsoclypus, in having long open parallel petals (that are slightly asymmetrical, the two columns of pore-pairs unequal in length in the same petal ), a circular ambital outline, and a distinctly flat oral surface, where the periproct is situated.
Agassiz, A. 1883. Reports on the results of the dredging of US coast survey steamer Blake. Memoirs of the Museum of Comparative Zoology, Harvard 10 (1) 94 pp, 32 pls.
Mortensen (1948) distinguished Conolampas from Hypsoclypus by its much better developed phyllodes, believing that in Hypsoclypus the phyllodes were narrow and uniserial to the peristome. However, the type species of Hypsoclypus, H. lucae, has phyllodes that are as well developed as those of Conolampas and there seems to be no reason for keeping the two separate.
T. Mortensen. 1948. A monograph of the Echinoidea: 4 (1): Holectypoida, Cassiduloida. Reitzel, Copenhagen, 363 pp., 14 pls.
P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections, 144 (3) 262 pp.