126 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 92 
more conspicuous in median and posterior segments, where they are 
much thicker, though shorter, than the limbate setae. 
The jaws were not described originally. They are as follows 
(proboscis dissected) : The maxillary parts, including carriers, ex- 
tend through setigers 3 to 13, the mandibles through setigers 1, 2, and 
part of 8. Carriers are long, slender, with an unpaired, ventral 
piece; forceps are thick, distally hooked, basally with six teeth; 
maxilla II has 10 teeth on each side, the distal tooth much the 
longest; maxilla III has a long tooth distally and four shorter 
teeth below; maxilla IV has a long tooth on each side (fig. 11, d). 
The formula is: I=6+1, II1=10, I1[=5, IV=1. The ventrally 
Jocated mandibles are dark, broad, flat, much shorter than the forceps 
(fie 1, @).. 
Setae are smooth, narrowly limbate; a denticulate region was not 
observed in any examined. D. robusta is known only through its 
original discovery. 
Family GLYCERIDAE 
Genus GLYCERA Savigny 
GLYCERA MEXICANA (Chamberlin) 
FIGURE 9, e 
Hemipodus mewxicanus CHAMBERLIN, 1919, p. 349 (U.S.N.M. No. 19372; Gulf of 
California). 
There is only an anterior fragment with proboscis retracted and 
the prostomium withdrawn into the anterior buccal cavity. The 
aileron of the jaw has a broad, spreading base and a long, produced 
fang (fig. 9,¢). Setae include (1) superior, simple, and (2) inferior 
composite. In both of these respects it is a typical Glycera Savigny, 
to which it is hereby referred. 
In anterior segments the presetal lobe is bifurcated; the postsetal 
lobe is short, entire. The presetal lobes are long and slender and 
resemble the equally long ventral cirri. Dorsal cirri are inserted 
far above the parapodial base. 
There is little to distinguish this from G. papillosa Grube, from 
western South America. It bears resemblances also to @. lancadivae 
(Berkeley, 1939, p. 334) from Guatemala. 
Family CIRRATULIDAE 
Genus CIRRATULUS Lamarck 
CIRRATULUS GRANDIS Verrill 
Cirratulus grandis VERRILL, 1873, p. 606. 
Cirratulus tenuis VERRILL, 1873, p. 607 (U.S.N.M. No. 15284; Vineyard Sound, 
Mass.). 
The collection is labeled cotype. The prostomium is anteriorly 
rounded, slightly acute, without eye spots or other color marks. 
