WORMS 181 
calcareous tubes; these are often found on rocks, in coral, and 
in the shells of mollusks. The anterior end of the body is more 
highly developed than the posterior end. 
FAMILY sPIONDE 
Genus Nerine 
N. agilis. Two to three inches long; slender; somewhat flattened 
at the anterior end; head conical and sharp; the two tentacles about 
one half of an inch long; four eyes; color reddish-brown, light green 
on the sides; gills red; tentacles greenish-white. It burrows with ex- 
treme rapidity and lives on exposed beaches near low-water mark. 
N. coniocephala. Two and a half inches long, one sixteenth of an 
inch in diameter; head conical ; body flattened on the dorsal side, round 
on the ventral side; has two long tentacles turned backward anda mem- 
brane on the gills of the anterior segments; gills red; bristles long and 
numerous. 
FAMILY CIRRATULDE 
Worms of this family have a cylindrical body, more or less atten- 
uated at each end; segments similar throughout; many segments 
with long, filamentous 
cirri which act as gills ; 
and a conical head. XE \ We 
They live in burrows. 
Genus Céirratulus 
C. grandis. Four to 
six inches long; head 
acute; segments numer- 
ous, short, and distinct ; 
color dull yellow, or 
orange, to brown, often 
iridescent beneath; ven- 
tral surface somewhat 
flattened. Numerous 
long, filamentous, red to ij ANZ a 
orange-colored cirri ex- Ls “Ui eri ee \ 
tend nearly the whole —f) f it~ \ ov 
S27 
a r\ 0" E/| 
length of the body and (‘co \ 
act as gills. It is com- 
mon in sand and gravel 
at low-water mark from Cirratulus grandis. 
Cape Cod to New Jersey. 
SS) 
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