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Class Annelides. Order Errantes.
Character.
Head distinct, antenniferous:
proboscis in general with four jaws in adjunct pairs:
feet well developed, not uniform in structure, for some are furnished with a superior cirrus and usually with branchiae, but without scales; while others, usually squamous, are neither branchial nor cirriferous, and these alternate, for a definite space, along the sides:
branchiæ sometimes obsolete, always rudimentary and concealed, in the form of crests or tubercles situated on the upper part of the dorsal branch of the foot above the cirrus.