1918, University of California Publications in Zoology, page 313:
Surface either with (1st) a few (2-4) strong lirae above, their interspaces smooth, the base with about 8 concentric lirulae, or (2nd) more numerous narrow irregular lirulae above, those of the base still smaller, or (3rd) the spiral sculpture ...
1958, Katherine Van Winkle Palmer, Type Specimens of Marine Mollusca Described by P.P. Carpenter from the West Coast (San Diego to British Columbia), Geological Society of America (→ISBN), page 138:
Species most ornate, with delicate sculpture. Umbilicus with 3 internal spiral lines, crossed by lirulae: operculum sculptured.
1985, Piet Kaas, Richard A Van Belle, Monograph of Living Chitons: (Mollusca: Polyplacophora), BRILL (→ISBN), page 142:
The position of the mucro, and the number of granulose lirulae on the ante-mucronal area, however, are exactly in accordance with those of columnarius. The dorsal elevation of the intermediate valves varies from 0.54 - 0.86 […]
