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Summary.–With the characters of the Group.

PHASCOLOSOMA TERES, n. sp.

Body 40 mm. long, introvert ca. 8 mm. Posterior portion stout, sharply demarcated, ellipsoidal, containing the coiled portion of the gut.

Colour yellowish, merging to dirty bluish white over the posterior part.

Skin smooth, iridescent, devoid of papillae, translucent posteriorly, beset with numberless glands. A simple wreath of 15 tentacles surrounds the mouth. Forward on the introvert 10 rows of backwardly directed, slightly curved, brownish hooks, .06-.08 mm. long.

Two eye-spots. Alimentary canal free, without spindle-muscle or mesenterial attachment save close to the anus. Spiral winding absent, but the tube much coiled in its middle portion. Hindgut very long. Two nephridia, the right the larger, one-twentieth of the body-length. Simple contractile vessel.

Hab. Firth of Clyde. Dredged from 60 fathoms.