Length, 22 mm.; greatest width, 3 mm. Type--M. C. Z. 2, 166. Taken at Laguna Beach, Sept. 15, 1917. The tube in which the type was found is 35 mm. long. The wall is thickened by the adhesion of fine particles of sand, fragments of shell, etc. TEREBELLIDÆ _Leaena videns_ sp. nov. The prostomium extends as a convex hood or inverted scoop above the mouth; along its posterior border is a series of long, crowded, tentacles. The prostomial fold behind the tentacles is crossed by a transverse band of distinct eyes, the band narrow above and widening on each side. Mouth a crescentic slit with corners curved caudad; bordered behind by a thick lip the anterior median edge of which is truncate. No dorsal cirriform process on III or any other segment, all being wholly smooth. A characteristic of the species is the large number of setigerous segments, at least thirty-one being present (IV-XXXIII) in the type, and possibly more. The setæ differs from those of _nuda_ in their longer fine tips and more geniculate appearance at base of this region. The uncini are characterized by an exceptionally long beak which, beyond its strongly curved base is straight; the sinus narrow, the process arising near its middle, low obtuse; vertex not comparatively high, crossed by mostly four series of denticles; body of uncinus rather narrow, the shoulder on convex side much farther toward the end than, e.g., in _nuda_ and well below level of bottom of sinus. The type is incomplete, only near thirty-eight segments being present. The color is noted as pinkish in life. At present it is fulvous in the type. Length of incomplete specimen not in excess of 12 mm.; greatest width, .8 mm. Type--M. C. Z. 2, 167. _Pista fratrella_ sp. nov.