40 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
long drawn-out tip. When the preparation of a parapodium is squeezed 
under the cover glass, the long and short setae seem to alternate. 
Tubes are not known. Exceedingly numerous polygonal eggs, about 
150u by 110y, are observed in a female in May. The intestinal content 
of two specimens from station 3 (mean particle size 0.126 mm) con- 
tains many sand grains 0.2 mm in diameter and even an unbroken 
Coscinodiscus species test 0.25 mm in diameter, in addition to smaller 
grains and much fine detritus. Thus, the species may be a not very 
selective deposit feeder. 
The name refers to the serrated neurosetae. 
Diaenosis.—A Tharyx species with serrated neurosetae after the 
seventy-fifth to one-hundredth setigers. Median segments not bead- 
like. Posterior end not inflated. Anus dorsal. 
DirFERENT Dragnosis.—Among the Tharyx species in Hartman 
(1959, 1965b), but omitting 7. annulosus Hartman (p. 31) and add- 
ing T. secundus, new species, and Tharyzx sp. described by Berkeley 
and Berkeley (1941, from California), only 7. dorsobranchialis (Kirke- 
gaard), JT. tesselata Hartman, and the mentioned Tharyz sp. are 
known to have serrated setae. Of these, 7’. dorsobranchialis has a 
very peculiar arrangement of gills. Tharyx secundus has a beadlike 
middle body region and an inflated posterior end. Tharyx tesselata 
has an inflated posterior end and a characteristic tube. Also, the 
serrated broad neurosetae start very roughly at the fiftieth setiger 
(from material kindly sent by Dr. O. Hartman). The Berkeleys’ 
species has four achaetous rings following the prostomium, and the 
serrated setae seem to start at a low-numbered setiger. Thus, the 
new form is easily distinguished from the species with serrated setae. 
The form seems also to be different from all those species that are 
known to have flattened posterior neurosetae for which serration has 
not been described. We note, however, that there is a very minute 
serration on the flattened neurcsetae of T. multifilis Moore from our 
samples; in fact, we cannot distinguish anterior fragments of the new 
species from those of T. multifilis. 
Family FLABELLIGERIDAE 
Brada sachalina Annenkova? 
Brada sachalina.— Ushakov, 1955, p. 310. 
There are about 10 specimens up to 3 cm long that are profusely 
covered with sand grains and usually have 23 setigers (22-25). The 
notosetae (three to five per bundle) are longer and thinner than the 
neurosetae (five per bundle). The dermal papillae are dome shaped 
with a short filiform tip; there are two (sometimes three) rows per 
segment. The nephridial papillae arise on the anterior portion of the 
