Dall, 1871
Pseudoconch rounded at both ends, covered with large warts which are smaller and more closely spaced towards postero-dorsal side. Aperture wider than in Corolla ovata, nearly identical to that of Corolla calceola. Swimming disc translucent and yellowish, broadly rounded to quadrangular, sometimes with two depressions in posterior margin; protruding far behind pseudoconch border. Small mucus glands along border of swimming disc. Proboscis free from upper surface of swimming disc. Lateral foot appendages, forming corners of proboscis, rounded. Mantle gland shows one complete and two incomplete transverse transparent bands, gland slightly asymmetrical. Pseudoconch length 40 mm, width 25 mm, diameter of swimming disc 80 mm.