COMPLETE HARTMAN: POLYCHAETES FROM CALIFORNIA 109 



Genus Ghaetozone Malmgren, 1867 

 Type G. setosa Malmgren, 1867 



This genus differs from Caulleriella (see above) chiefly in that setal 

 spines are distally entire instead of bifid. These spines may form cinctures 

 about the segments in the far posterior region of the body. 



Ghaetozone setosa Malmgren, 1867 



Ghaetozone setosa Fauvel, 1927, p. 101, fig. 35. 



Collections. Many individuals come from Tomales Bay, California, 

 in intertidal areas, to southern California in shelf depths. 



Length of the body is 10 to 25 mm. The prostomium is conical, longer 

 than wider, directed forward, and lacks eyespots. The buccal region 

 is smooth and about as long as the prostomium. Paired palpi are inserted 

 dorsolaterally, on the first visible segment behind the buccal region. 

 The one after that has a pair of lateral branchiae inserted slightly lateral 

 to the palpal insertion, and the next one has biramous parapodia with 

 fascicles of long, slender, distally pointed setae. The setae in notopodia 

 are larger than those in neuropodia, and all are directed laterally. 



Lateral branchiae are irregular in occurrence but present on some 

 segments throughout the body; their insertion is immediately above 

 the notopodial ridge. All anterior and median parapodia have only 

 long, slender and distally pointed setae. At about segment 79 to 90, or 

 near the middle region of the body, the first yellow acicular spines are 

 present in neuropodia; at first they number only one or two, accom- 

 panied by setae. Farther back they form transverse series of 7 to 9 in 

 a row and alternate with capillary setae. Notopodial acicular spines are 

 first present at about segment 80 to 100 and number 4 to 6 in a series 

 farther back; they resemble those in neuropodia. The posterior end of 

 the body tapers to a blunt end with a terminal pore and a short ventral 

 lobe ; the last few segments are not inflated. 



Chaetozone setosa is known from Atlantic and Pacific oceans, in 

 littoral zones and associated with silty sediments. 



Ghaetozone corona Berkeley and Berkeley, 1941 



Chaetozone spinosa corona Berkeley and Berkeley, 1941, pp. 45-46. 



Collections. Hundreds of individuals have been taken in quantitative 

 samples from southern California, mainly in shelf depths. Greatest 

 concentrations were at VELERO IV Stations 4759, 4822, 4869, 5043, 

 5161, 5539, 5740, with more than 50 specimens in some samples. 



