of tlie Virginian Coast. 67 
GENERA INCERT^ SEDIS. 
CABIRA n. gen. 
Sides of head produced into thin plates, which are 
covered with papillae. First segment with two pairs of 
tentacular cirri, without setse. Dorsal cirri on all seg- 
ments; no ventral cirri. Ventral setae, stout hooks be- 
ginning on the 6th setigerous segment, one to each ramus. 
Cabira incerta n. sp. 
PLATE XI, FIGS. 155-157. 
Head convex above and below, bluntly rounded in front, 
lateral margins prolonged into membranous expansions, 
which project in front of the head, and are densely covered 
with minute papillae. Antennae two, minute, arising from 
a short swollen base, lateral, situated at the anterior 
third (f. 154). 
Buccal segment, in length about equal to the two follow- 
ing segments; no setae; two minute tentacular cirri on 
each side; separated from the following segment by a 
deep lateral constriction. 
Feet. Dorsal ramus with a small dorsal cirrus; similar 
in all respects to the antennae and tentacular cirri ; beneath 
this arise from two to four delicate capillary setae (f. 157, 
a, b). Ventral ramus a small papilla, from the summit of 
which issues a strong hooked seta (f. 156). The first five 
setigerous segments have only the dorsal rami. 
Body convex above, flat below. Posterior part not 
seen. 
Length of part examined (40 segments), 12"°". 
Color, light gray. 
Found living in a fragment of loosely compacted sand- 
stone. Dredged. 
