28 



BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



IXCEETAE SEDIS. 



CIRROBRACHIUM, gen. n. 



In the absence of a complete specimen, the only diagnostic 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' X., 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 characteri.stic 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 occupy 

 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 Oegojisida. 

 A few patches of the integument remain, which are 

 thickly 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 tlie 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- 

 niatophore. Close to the base of each sucker of 

 the ventral row arises one of the filaments above 

 mentioned. Those springing from the proximal 

 sucker.'' are about twice the diameter of the arm 

 in length; they gradually increa.«e 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 disapjwfar. The anus of the second pair are about one-fourth 

 longer than the first. The arrangement of the sucker.^ and filaments is the 



FlO. E. Clrriihrnnrhinm fill- 

 /erutn. Portion of third 

 right arm. X 5. 



