264 PROCEEDINGS OF THE ACADEMY OF [May, 



about 4") nun. The width of the body alone at X is 4.8 mm., 

 to the ends of the parapodia 11 mm., and to the tips of the setae 

 16.5 mm. Apparently the elytra number fifteen pairs, borne on 

 the usual somites. Segmental papillse begin on V and soon become 

 long and slender, but instead of pointing freely caudad, as in 

 Hannothoe imbricata and allied forms, they are directed dorsad 

 between the bases of the parapodia. 



The head is broad, its length being about three -fourths of its 

 greatest width, which is about one-third of its length from the an- 

 terior end. Its lateral margin is almost angulated; the anterior 

 fissure is deep and wide, and the ceratophore of the median tentacle 

 occupies it in such a way as to give the impression of having 

 pushed apart the two lobes of the head. These lobes are rounded 

 anteriorly and have no distinctly produced peaks. 



The eyes ai'e black, circular and widely separated. Those of the 

 posterior j>air are less than their own diameter from the posterior 

 margin of the head and so far apart as to be partly laterad in posi- 

 tion. The anterior ai"e slightly larger, separated from the extreme 

 anterior margin by less than their own diameter, and latero-ventral 

 in position. 



Median tentacle absent, its ceratophore of large size and marked 

 by a conspicuous chocolate-colored band. Lateral tentacles arise at 

 a level quite below the dorsal surface of the head lobes and partly 

 overlapped by the ceratophore of the median tentacle. They have 

 a length of about one and two-thirds the width of the head, are 

 slender and tapering, with a brown pigmented subterminal enlarge- 

 ment and a rather long filiform tip. The single palpus remaining 

 on the type specimen is an elongated, almost whip-like structure 

 eight times as long as the head. It bears a single line of cilia on 

 the medial side, while much shorter clavate cilia are scattered over 

 the general surface. Its cuticle is remarkably ii'idescent, a condi- 

 tion not found elsewhere in this worm. Frontal ridge bi'oad and 

 low. The tentacular cirri are missing. 



Typical para2)odia are long and slender, the neuropodiura promi- 

 nent and bearing near its base the small lobe-like notopodium. The 

 dorsal border of the former is straight and slopes gently downward, 

 to pass without angulation into the dorsal edge of the acicular lobe, 

 the base of which is met abruptly by the sharply u])turned ventral 

 margin. The aciculum projects but slightly. 



