COMPLETE HARTMAN: POLYCHAETES FROM CALIFORNIA 107 



Species of Tharyx are provided only with limbate setae terminating 

 distally in a slender, hairlike tip. Those of Caulleriella and Chaetozone 

 are acicular in part. It has been practice (Fauvel, 1927, p. 90; Berkeley 

 and Berkeley, 1952a, p. 31) to separate the several species of these 

 genera from one another by the arrangement of these spines. In species 

 of Caulleriella they are held in discrete series at the sides of the body 

 throughout the length ; in species of Chaetozone they form cinctures 

 encircling the body in posterior segments. This character is not reliable, 

 mainly because specimens are frequently taken which are in fragments, 

 have lost the diagnostic posteriormost segments, and then cannot be 

 generically assigned. For this reason a separation is here proposed, 

 recognizing the distal character of the acicular spines ; in species of 

 Caulleriella they are distally bifid ; in those of Chaetozone they are 

 distally entire or at least not bifid. 



Genus Caulleriella Chamberlin, 1919 

 Type G. bioculata (Keferstein) 1862 



The buccal region consists of one or two visible achaetous segments. 

 The first setigerous segment has a pair of long palpi, sometimes accom- 

 panied by a pair of lateral tentacles ( =branchiae). Bifid acicular setae 

 or spines are present in neuropodia and some notopodia but may be 

 absent in the latter. 



Caulleriella differs from the nearly related Chaetozone (see below) 

 chiefly in that species of the latter have spines distally entire or at least 

 not bifid. It differs from the nearly related Tharyx in that the latter 

 has all setae limbate and distally pointed. In species such as Chaetozone 

 zetlandica Mcintosh (see Fauvel, 1927, p. 99) where acicular spines 

 are limited to posterior neuropodia, the generic status is uncertain with- 

 out complete specimens. 



Caulleriella hamata (Hartman) 1948, new combination 



Tharyx hamatus Hartman, 1948, pp. 37-38, fig. 10. 



Collections. Numerous individuals were taken in California, from 

 Point Conception south to San Diego, in quantitative samples, from 

 sediments of silt and mixed bottoms, in shelf depths. 



Length is 12 to 15 mm. The prostomium is acutely pointed in front 

 and usually has a pair of eyespots located at the sides. Only slender 

 capillary setae occur in anterior segments. Acicular spines are first 



