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