204 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Color, light brown to gray, with darker spots dorsally. A large dark spot in front of dorsal gill 
on either side. 
The collection contained 3 fragments from Hucares. Two, apparently from the same specimen, 
were 50 and 44 mm. in length. Posterior end not preserved. Greatest breadth 4 mm. 
Family C1RRATULM. 
CIRRATULUS Lam. 
Cirratulus melacanthus Grube. 
Cirratulus melacanthus Grube, Die Familie der Cirratuliden; Bericht. liber die Thatigkeit der Naturw. Sect, der schlesischen 
Gesellsehaft im Jahre 1872, p. 31. Quoted from Ehiers, Annelids of the Blake, p. 155. 
Head segment too badly mutilated for identification. I have identified the specimen from 
the structure of the parapodium. Collected from Guanica Bay. 
Cirratulus nigromaculata, n. sp. 
Body short, 10 mm. in length, rather less than 2 mm. broad in widest portion; tapering grad- 
ually toward either end, anterior end much more blunt than posterior. Head rather thick, rounded, 
much narrower than segments immediately behind it (fig. 66). 
Segments very short, their limits difficult to make out in con- 
tracted alcoholic material. Set* in two bundles, the dorsal rather 
longer than ventral, all very delicate, capillary, and difficult to 
see. From the fifth or sixth, or possibly both, the dorsal gills 
arise on either side (fig. 66). These are long and thick, nearly 
half the length of body. There are at least four on a side, more 
or less united at their, bases (only three shown in the figure). At 
intervals along the back appear the much more delicate lateral 
gills. These break away so easily that it is impossible to say how 
many are normally present. In one of the two specimens in this 
collection there are five, the last arising three-fourths of the 
distance from head to tail. 
Color, ventrally white, with a decided brownish tinge dor- 
sally. Whole body spotted with irregular black marks, especially 
numerous along the mid-dorsal line. The dorsal gills are white, F,G - 66.— Anterior portion of Cirratulus 
with numerous black bands (fig. 66). The lateral gills are cov- 
ered with minute brown spots, except for a colorless band near the apex. Extreme tip of gill brown. 
Collected from Ensenada Honda, Culebra, 
Cirratulus elongatus, n. sp. 
Head short, conical (fig. 67). The three following segments smooth, rather long, limits between 
them not sharply marked off; without appendages. Set* begin on fourth segment; from here seg- 
ments increase rapidly in width up to tenth, 
and from there decrease in width for a short 
distance, then remaining of uniform breadth 
to posterior end. No eyes. Lateral gills as 
long delicate cirri, easily broken away; only 
a very few remained attached in the single 
specimen at my disposal. After about the 
fiftieth segment the body becomes very thin- 
walled, and is much coiled. Set* in two 
rows, long, delicate, capillary (fig. 67). Color, 
yellowish brown. Gills a darker brown. 
Length 60 mm. Breadth at widest, portion, 
2 mm. ; at narrowest, 1 mm. 
From the structure of the gills and 
arrangement of the setae, I have included this specimen provisionally in this genus. Too many of 
the gills had been lost to make the identification positive. 
Collected from Ensenada Honda, Culebra. 
'is. 67. — Anterior end of Cirratulus 
elonyatus, x 23. 
a b c 
Figs. 68, a, b, c— Setae 
from Phyllochsetopterus 
claperedii, x 143. 
