80 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.15 



in species of Glycera. The proboscis is long (H. calif orniensis, below) 

 to short and barrel-like (H. yenourensis Izuka). Its distal end is pro- 

 vided with 18 short, fleshy, widely spaced papillae. The distal armature 

 consists of 4 falcate jaws and attached rodlike ailerons (pi. 12, fig. 1). 

 The proboscidial organs, in all instances where they have been described 

 are elongate oval or filamentous structures, with little (pi. 12, fig. 2) or 

 no surface ornamentation. These organs are more or less thickly strewn 

 over the surface, but the 18 longitudinal furrows are more clearly 

 distinguishable than in species of Glycera. Body segments are usually 

 more or less clearly bi- or triannulate. 



Parapodia consist of only neuropodia, with fanshaped fascicles of 

 composite spinigers and single acicula. The presetal lobe is simple, entire 

 and tapers distally to a shorter or longer triangular process; it ex- 

 ceeds in length the postsetal lobe which is also entire, broadly rounded; 

 usually it is much shorter than the presetal lobe. The first 2 pairs of 

 parapodia resemble those farther back but are smaller and lack a dorsal 

 cirrus. Farther back the dorsal cirrus is present and continued to the 

 end; it usually has a thickened fleshy boss near its base. This character 

 has been observed for all species I have examined. In the last few seg- 

 ments the ventral cirrus enlarges so as to resemble the postsetal lobe; 

 the dorsal cirrus diminishes in size. 



The body terminates in segments that taper distally to a slender 

 end and a pygidium with a pair of short to longer conical or filamentous 

 processes. 



Specific differences that distinguish the species from one another are 

 especially to be found in the proboscidial organs, and the comparative 

 lengths of the presetal parapodial lobes. The genus is known for 6 species, 

 including one newly described. In order of their discovery, they are: 

 H. simplex (Grube), 1856, H. roseus Quatrefages, 1866, H. borealis 

 Johnson, 1901, H. yenourensis Izuka, 1912, H. calif orniensis Hartman, 

 1938, and H. armata, new species. The genus is partly reviewed else- 

 where (Hartman, 1940, pp. 242-244). H. yenourensis Izuka, from 

 Japan, has been referred to H. borealis (Okuda, 1939, pp. 234-236, 

 fig. 9) but I consider the 2 distinct (see chart, following). 



