BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
INCERTAE SEDIS. 
CIRROBRACHIUM, gen. n. 
In the absence of a complete specimen, the only diagnostio character which 
can be assigned to this new genus is the presence of a row of filaments along 
the outer or ventral side of each arm, except those of the fourth pair. 
26. Cirrobrachium filiferum, sp. n. 
Habitat, — Station 17; equatorial Pacific Ocean, north of the Marquesas 
Islands; September 10, 1899; lat. 0° 50’ N., long. 137? 54’ W.; trawl, 2463 
fathoms; temperature, surface, 79°; one fragmentary specimen. [H. 130.] 
The specimen upon which this new species, the type of a new genus, is based 
consists unfortunately only of the head and arms, which have suffered denuda- 
tion of the integument here and there. The suckers are, however, almost all 
intact, as also the characteristic filaments which spring from beside them. A 
description as complete as I have been able to prepare of the specimen is given 
below. 
The Head, so far as can be seen, was flattened on the dorsal side, and slightly 
excavated for the funnel below. The eyes are large and prominent, and oceupy 
the whole of the lateral surface of the head. The eyelids have disappeared, but 
there can be little doubt that they were of the type common to the Oegopsida. 
A few patches of the integument remain, which are 
thiekly covered with bright pink chromatophores. 
The Arms are slender, rounded, and. tapering, 
and bear, besides the suckers, a series of long slen- 
der filaments which form the characteristic pecu- 
liarity of the genus. The first pair are about 
15 mm. in length, measuring from the front edge 
of the eye. The suckers are in two rows, small 
and stalked, and do not show any trace of a 
modification into hooks. Immediately to the 
proximal side of each sucker is a dull pink chro- 
matophore. Close to the base of each sucker of 
the ventral row arises one of the filaments above 
: : : . mentioned. Those springing from the proximal 
Fie. Æ. Cirrobranchium fili- : 1 
feram. Portion of third suckers are about twice the diameter of the arm 
Tight arm. X 5. in length; they gradually inerease to the middle 
of the arm, where their length is three or four 
times the thickness of the arm ; they then diminish towards the tip, where 
they finally disappear. The arms of the second pair are about one-fourth 
longer than the first. The arrangement of the suckers and filaments is the 
