26 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
There are many anterior fragments from stations 1-3, 5, 6, and 8: 
mature females with up to 70 setigers about 3 cm long and almost 
2.5 mm wide without parapodia, some posterior fragments that pre- 
sumably belong to this species, and several anterior fragments of 
small individuals about 0.5 cm long and 0.5 mm wide. 
Description.—The prostomium is broader than long and anteriorly 
flattened. There are two large crescentic eyespots and a distinct 
occipital antenna. The dorsal sense organ (caruncle) reaches to about 
the twenty-fifth setiger. The palps are lost in all specimens. Gills 
start at the second setiger and number 24 pairs in a well-preserved 
young animal, and 27, 32, and 33 pairs in mature females. The first 
pair is not quite as long as the notopodial lamella; the next two or 
three pairs, as well as the last one or two pairs, are shorter than the 
rest. A fully developed gill is shown in figure 6a. Notopodial postsetal 
lamellae in the middle of the gill-bearing region are auricular ventrally. 
Their distal ends are fairly blunt in adults (fig. 6a), whereas in younger 
specimens the tip is tapering in the long axis of the lamella so that 
the lamella appears to point upward. Posterior to the gill-bearing 
region a ridge from the notopodial lamella on to the dorsum occupies 
about one-fourth the distance between the cirri on each side in the 
holotype but is not distinct in the other large specimens. Genital 
pouches occur from the second to seventh setiger onward through 
at least the seventieth setiger. 
Neuropodial hooks are found in an old and a young specimen from 
the thirtieth to thirty-third setiger onward. There are two secondary 
hooks side by side above the main fang. Dorsal hooks are absent on 
the anterior ends, as well as on the posterior end checked. Stout 
ventral neurosetae begin on the twenty-sixth and thirty-third setiger 
with two old individuals, at the twenty-fourth with the young animal 
mentioned above, and farther forward with another young specimen. 
The pygidium has nine slender cirri that are slightly longer than 
the pygidium is wide; possibly their number varies. Polygonal eggs 
from genital pouches are about 125y in diameter. The animals are 
yellowish pink. 
The name refers to the type-locality. 
Diaenosis.—A small Laonice species with genital pouches from the 
second to seventh setiger. Dorsal sense organ (caruncle) to about the 
twenty-fifth setiger. Approximately 30 pairs of gills. Dorsal ridges 
posterior to the gill-bearing region inconspicuous. Dorsal hooks absent. 
Ventral hooks with two secondary teeth side by side above the main 
fangs. 
Discussion.—We follow Séderstrém (1920) in using the occurrence 
of genital pouches for separating species of the genus. Sdderstrém 
has found a fairly close relation between the end of the atokous region 
