124 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



scopic parts. Species of these three genera are characterized by having a 

 pair of long palpi inserted on the dorsal side and in front of the first 

 parapodial segment ; the palpi are usually broken off near the base in 

 collected samples. Branchiae number no more than a single pair to a 

 segment, when present, and are inserted near the notopodial base ; these 

 too may be missing in preserved collections. In species of Tharyx all 

 setae are distally pointed and hairlike. In Chaetozone the acicular spines 

 of posterior parapodia tend to form transverse rows encircling the seg- 

 ments (resembling cinctures) ; whereas in species of Caulleriella the 

 acicular fascicles are more widely separated from one another medially. 

 Lacking posterior segments of any of these, the species can either be 

 confounded or unidentifiable. The interpretations indicated below are 

 largely based on specimens considered nearly or altogether entire. 



Genus CHAETOZONE Malmgren, 1867 



Chaetozone spinosa Moore, 1903 

 Moore, 1903, pp. 468-470, pi. 26, figs. 73, 84. 

 Okuda, 1939, p. 238, fig. 11. 



Specimens come from San Pedro, Santa Catalina, Tanner, West 

 Cortes, San Clemente and Long Basins and from Patton escarpment. 

 They measure only about half as large, or less than, those first described 

 from Sagami Bay, Japan, in 305 meters ; these were 65 mm long by 5 mm 

 wide and consisted of 1 12 segments. 



The prostomium is pointed in front and lacks eyes. Acicular spines 

 are first present from about segment 70, and in far posterior segments 

 they form complete paired series so that separation between notopodium 

 and neuropodium is obscured; there is, however, a broad middorsal and 

 a midventral space. Acicular spines are yellow, slightly curved and dis- 

 tally entire. 



Two specimens from Patton escarpment (Sta. 5937) differ from 

 typical ones in that neuropodial spines are first present at segment 24, 

 and in notopodia at segment 64. The parapodial spines in posterior seg- 

 ments encircle the body. They are acicular, slightly curved and distally 

 entire. 



Chaetozone spinosa is known from both sides of the north Pacific 

 Ocean, in moderate to basin depths. 



