48 IOWA STUDIES IN NATURAL HISTORY 
to the links of the chain. A number of embryos were found in 
the bottom of one of the tubes. Professor Nutting has described 
this annelid in his narrative. 
Localities: Jamaica; English Harbor, Antigua; Florida. 
Pomatostegus stellatus Schmarda 
Plate VI, Figs. 9 and 10 
This Serpulid is 55 mm. long, including the branchie, and it 
is 5 mm. wide in the thoracic region. The body is hemispherical 
in cross-section and has a wide ventral groove. The body is 
flesh-colored with yellow cross stripes shining like silk. The 
thorax includes 7 segments, each bearing sete laterally. As 
in the specimen previously described the cirri of the thorax are 
modified into an undulating membrane used in smoothing the 
inside of the tube. In the present specimen, however, this 
membrane begins at the second thoracic segment, and without 
interruption it continues into the collar. The collar is very 
high and frilled; and in the ventral median line it is projected 
into a long, pointed triangular lobe, which lies between the two 
whorls of the branchizw. The ventral shields are confined to 
this region. 
The collar sete are long and slender, slightly constricted and 
then enlarged just below the head of the main shaft. In the thor- 
ax the sete are limbate, and are of different lengths. The uneini 
in the thoracic tori are large and number about 12 to each 
torus. They are of the same shape in the abdominal region, 
but are fewer to a row. 
The branchie are spiral, about a turn and a half. The 
filaments are bright rose color, lightly barred with white. The 
operculum in this specimen is yellow, and it has three vertical 
disks, united by a central vertical column. The number of 
disks varies from 3 to 5 in different specimens. The peduncle 
is wide and thin. Its edges are cutaneous and wing-like. 
This worm builds a calcareous tube like that of Spirobran- 
chus. It was found attached to the links of an old anchor-chain 
at English Harbor, Antigua. 
Localities: Jamaica; Porto Rico; English Harbor, Antigua; 
Culebra. aL Aa | 
