332 PROCEEDINGS OF THE ACADEMY OF [April, 



Prostomium small, nearly as long as broad, depressed, with a median 

 dorsal furrow dividing it for the entire length into two smooth, convex 

 lobes that taper at the anterior end gently into the bases of the slender 

 tentacular ceratophores. No peaks and no prominent ocular lobes. 

 Eyes two pairs, very small; the posterior strictly dorsal near caudal 

 border; the anterior lateral on widest convexity of prostomium. 

 Median ceratophore arising from cephalic sinus, slender, about one-half 

 of its length extending beyond lateral ceratophore. Median tentacu- 

 lar style about five and one-half times length of prostomium, slender, 

 tapered, smooth, with a moderate subterminal enlargement and a 

 very delicate terminal filament about as long as the prostomiiim. 

 Lateral tentacles arising from the frontal prolongation or ceratophores ; 

 styles slightly more than one-half as long as the median st}de, very 

 slender, without evident subterminal enlargements and the terminal 

 filaments relatively longer than those of the median tentacle. The 

 single palp remaining is moderately stout at the base, about five 

 times as long as the prostomium, strongly annulated and tapered to 

 a very short terminal filament. 



Peristomial parapodia apparently cjuite achtetous. Tentacular 

 cirri like median tentacle and about three-fourths as long, the ventral 

 slightly shorter. Notocirri alternately longer and shorter; the 

 longer styles freciuently having a line of fracture or articulation near 

 the middle which gives the appearance of a greatly elongated cirro- 

 phore. Posteriorly the longer cirri follow immediately the elytra 

 and are succeeded by shorter ones. The neurocirrus of somite III of 

 one side is duplicated. 



The specimen is 55 mm. long and has 107 segments. The elytra 

 are small, leaving the entire middle of the back uncovered, and there 

 are thirty-six pairs the first fifteen arranged as in Harmothoe to somite 

 XXXII, the sixteenth on XXXIV and the remaining ones on every 

 third following segment. Von Marenzeller's specimen, which was 

 dredged at a depth of 4S0 m. off Eno-sima, Japan, consisted of two 

 pieces. The anterior of nineteen segments bore ten pairs of elytra 

 arranged like their homologues in Harmothoe, etc. The posterior 

 piece consisted of twenty-seven segments terminated by a pygidium 

 and bearing seven pairs of elytra on the third, sixth, eighth and every 

 third segment 'following. Marenzeller considers that somites XX to 

 XXIII along with tw^o pairs of elytra on XXI and XXIII have been 

 lost and that the first three pairs of elytra on the posterior piece are 

 borne, therefore, on XXVI, XXIX and XXXI. This plachig of the 

 elytra is the only discrepancy existing between his description and 



