1. There are no bulbs on the tentacles and no radial canals . 2. Centripetal canals may be present or absent and the radial canals are unbranched. 3. Radial canals are as described for the genus.4. There are four radial canals and four marginal bulbs, each with two tentacles. 5. The gonads are located at the radial canals ; they do not reach the manubrium. 6. No radial canals or secondary tentaclesvare present. 7. From the radial canals extend many lateral canals, each of which leads to a tube foot. 8. The gonads are four yellowish structures embedded in the surface of the epidermis beneath the radial canals . 9. The subumbrellar part of the radial canals have four gonads that are leaf-shaped and flattened. 10. Five or more radial canals extend from the ring canal, one in each arm above the ambulacral groove.
