BARBADOS-ANTIGUA EXPEDITION 205 
Below these is a regular row of parapodia, each bearing a mi- 
nute tuft of sete and also a long oval transverse ridge on the 
summit of which is a line of denticles resembling the teeth on 
the radule of certain snails. 
The tubes in which these beautiful worms retract are parch- 
ment-like in consistency, but often covered with mud. They 
are usually six or eight inches long and quite firmly attached to 
the stones on which they grow. Attempts to photograph this 
display were not very successful, as the water was not sufficient- 
ly clear for the best results. The worms were quite sensitive to 
stimuli and would quickly retract upon being touched. A great 
quantity of these exceedingly interesting serpulids was collected 
and preserved for future study by Miss Mullin. 
Another species, superficially much like that just described, 
was collected by the writer on the roots of the mangroves and 
later by Miss Mullin in Falmouth Harbor. The branchial crown 
is bilobed; but when fully extended forms a helicoid whorl of 
graceful branchiw which are regularly barred, rufous and whit- 
ish. Each of these tentacle-like gills is closely pinnate, having 
a row of filaments on each side projecting inward and upward 
from the main stem. On the back or outward aspect of the 
stem are two sets of organs in pairs, alternating with each other. 
One set consists of what are doubtless eye-spots, a pair on each 
of the lighter bars of the gill stem, looking like minute black 
beads; the individuals of a pair being well separated and occu- 
pying the postero-lateral aspect of the stem, each black dot be- 
ing surrounded by transparent ectoderm cells, the whole ap- 
pearance being that of quite typical primitive organs of vision. 
The second set of organs, referred to as alternating with these, 
occupy the postero-lateral aspects of the reddish brown bars. 
They are smooth, whitish filaments in pairs and appear to be 
tactile in function. The branchia ends in the flattened sword- 
like whitish filament which is capable of being bent like the end 
of an elephant’s trunk. The tubes occupied by this worm are 
like those of the species mentioned above. 
Several other species of serpulids were collected, but the pre- 
served specimens, although various methods were tried with 
