18 Journal of Entomology and Zoology 
posterior region. Prostomium projecting forward as a simple hood with rounded 
anterior corners and the median region of anterior edge nearly straight; dorsal sur- 
face in type longitudinally wrinkled. Ventrally the peristomium projects forward 
between the sides of the prostomium in a conspicuous lobe or lower lip which narrows 
somewhat distad and has the distal margin convex; surface longitudinally wrinkled. 
Second somite achaetons. The third bearing the first fascie of simple sete, the sixth 
the first uncini. Of the pinnate branchia one pair occur on the third setigerous 
somite and one on the second while the branchie with single series of branches in which 
the branches are less lamellate, are on the second (first presetal) somite, the simple 
branchie arising on the first setigerous somite. The first branchi# are attached 
near the middle of the dorsum, the others laterad close above the parapodia. The 
first and especially the second or simple branchie extending forward beyond the 
anterior edge of the prostomium. Color light fulvous or in part greyish. Number of 
segments near fifty-five. 
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, ete. 
TEREBELLID.® 
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- 
cne being present (IV-XXXIII) in the type, and possibly more. The sete differs 
from those of muda 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 muda 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. 
This form seems to be close to P. alata Moore. The type, which is much smaller 
than that of alata, differs in various details from the description of the latter. The 
principal lateral wings are confined to the third segment and are united across the 
dorsum of third somite instead of involving the anterior border of IV and crossing the 
latter above; connecting dorsal fold low and lacking any forwardly directed process; 
the wing rises as a high, rounded lobe on each side just below level of setigerous 
