BARBADOS-ANTIGUA REPORTS 51 
ment. The ventral shields of the 9 thoracic segments are dilat- 
ed anteriorly into acute angles. 
The sete, which are brown in color, are stout with a broad 
border. They are alike in both regions except for size, being 
larger in the thoracic region. In this region the tori extend 
from the sete fascicles to the shields. The abdominal tori are 
much shorter. The uncini are of the same shape throughout, 
but are smaller in the abdominal region. They are S-shaped, 
and on the terminal curve of the hook they are armed with a 
few teeth. They are in single rows. The dark spots between 
the bundles of sete and between the tori are larger in the 
thoracic segments. 
The light brown tubes are thin, fragile, and paper-like in 
texture. On the outer side they are covered with a fine gray 
mud. 
Localities: Jamaica; Key West; Falmouth Harbor, Antigua. 
Parasabella sulfurea Treadwell 
Plate VII, Figs. 7, 8, 9, 10, and 11 
The specimen here described is 67 mm. long, 18 mm. of which 
is in the length of the branchiz; it is 5 mm. wide at its maxi- 
mum breadth, tapering posteriorly to a sharp point. It is quite 
flat and arched slightly on the dorsal side. The color of the 
body is a pale purplish-brown, shaded deep in mid-dorsal line. 
At the base the branchiz are purple, gradually shading to a 
lavender, and merging to yellow at the tips. The branchie rise 
from a rounded base and have no inrolling on the dorsal side. 
A short portion of the distal end of the rachis is naked (no 
pinne). The slender filaments are webbed at the base. There 
are about 15 pairs. Just beyond the web and extending more 
than half way, each filament bears on either side of its outer 
surface a row of minute purple spots. 
The collar is low and the ends widely separated dorsally, but 
nearly in contact ventrally. Each ventral lobe is pad-like, or 
thickened. The edge is recurved. The torus of the first segment 
is arranged obliquely posterior to the dorsal free end of the col- 
lar. The torus is lateral and ventral to the sete fascicles in the 
thoracic region. The latter includes 9 segments. Beginning 
with the abdomen and extending throughout the remainder of 
