104 PROCEEDINGS OF THE) NATIONAL MUSEUM VOL, 92 
of their free parts. Both of these characters are perhaps the result 
of accidental fixation. Their resemblances to each other are far 
more striking. Both have the same well-rounded, nuchal lobe cover- 
ing the posterior part of the prostomium; the first segment lacks 
projecting setae or acicula; in both setal structures and prostomial 
parts are identical. Both have beadlike rows of small papillations, 
disposed transversely across the dorsum of the first few segments, 
most numerous over the dorsal bases of the parapodia. Both have 
similar papillations across the ventrum between the base of the 
ventral cirri and the body wall. A similar condition has been de- 
scribed for Z. longicirrata Berkeley (1923, p. 214). The notopodium 
is represented only by a short, papillar lobe. The ventral cirrus is 
inserted on the proximal half of the neuropodial base. Superior 
and inferior neurosetae resemble one another; the serrated region is 
short. Nephridial papillae are short and inconspicuous. 
L. alba is known only from Hawaii. 
Family SIGALIONIDAE 
Genus LEANIRA Kinberg 
LEANIRA ROBUSTA Verrill 
FIcurE 8, @ 
Leanira robusta VrERRILL, 1881, pl. 14, fig. 10 [fig. only]; 1885a, p. 426; 1885b, 
pl. 40, fig. 175 [fig. only] (U.S.N.M. No. 10320; off Newport, Rhode Island). 
The prostomium is trapezoidal, about one and one-half times as 
wide as long. There are four eye spots, weakly visible, deeply 
embedded in the anterior half of the lobe. The median antennal 
base lacks ctenidia. Its appendage is short, less than the prostomial 
length. Paired prostomial antennae are about as large, inserted on 
the dorsal base of the first setiger. The first parapodium is directed 
forward, most of it lying ventral to the prostomium; it is both 
shorter and smaller than the second, which is also directed forward. 
The first setiger has a ventral cirrus less than half as large as the 
dorsal cirrus and two or three slender, cirriform fringes inserted 
between the dorsal cirrus and the dorsal paired prostomial antennae. 
The third segment is well developed, not at all fused with the preced- 
ing segment; it is plain dorsally, without either cirrus or elytrophore. 
Throughout, both branches of parapodia have conspicuous fringing 
papillae on both anterior and posterior faces. 
Elytra are smooth, white, with entire margin, without fringe or 
papillae, but from the third with a lateral incision (fig. 8, a). The 
first pair is small, subcircular, Ieaving exposed the prostomial ap- 
pendages and the first and second parapodial lobes; they overlap one 
another only slightly in the median line. From the twenty-seventh 
