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Annelida |
 | | The lining membrane is ciliated in Aphrodita, Glycera, Polycirrus, Tomopteris, and Terebella; and it is curious that in these the blood-vessels proper are absent, with the exception of the first and last. |
 | | In Tomopteris their ciliary current carries spermatozoa inwards, and the same may occur in other forms. |
 | | The borers in shell, limestone, coral, and Melobesia, seem cosmopolitan, and the swimming Tomopteris is likewise widely distributed. |
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