Body elongate and vermiform to about 20 mm in life, but for the most part is only about 1 mm or less in diameter.
Calyx short and slightly flared; no arm lobes are evident, with eight adradial groups of capitate secondary tentacles, about 25 tentacles per group with the outer, abaxial tentacles in each group with abaxial glandular pads about midway along their length. The eight primary tentacles (also called anchors) are located on the calyx margin, four perradial and four interradial, between the groups of secondary tentacles, with morphology similar to the abaxial secondary tentacles, but shorter and thicker. (all from Larson, 1988)
Mouth quadrate with frilled lips. The calyx contains the stomodeum and four perradial gastric cavities which extend through the stalk and into the gastric sac; coronal muscle weakly developed and continuous. (all from Larson, 1988)
Mature gonads contain numerous enlarged follicles in parallel rows that extend adaxially into the stomach cavity and abaxially into the dilated perradial cavities (Larson, 1988).
The peduncle is highly contractile and not clearly separated from the calyx; circular in cross section. It contains four perradial gastric cavities, the stomodeum, and four broad, interradial infundibula with associated longitudinal muscle bundles which extend into the gastric sac. The basal portion of the peduncle is swollen into a cruciform gastric sac where the stomach and gonads are located, with gastric cirri in four longitudinal interradial groups. Most of the gastric sac consists of four swollen, pouch-like perradial gastric cavities containing the paired adradial gonads. (all from Larson, 1988)
Color in life is purple, with small white spots on the calyx and stalk - the white spots are most numerous on the surface of the gastric sac (Larson, 1988).
Specimens are deposited at the Royal British Columbia Museum in Victoria, British Columbia, and at the California Academy of Sciences, San Francisco, California (Larson, 1988).