COMPLETE HARTMAN: POLYCHAETES FROM CALIFORNIA 113 



Tharyx parvus Berkeley, 1929 



Tharyx multifilis parvus Berkeley, 1929a, p. 307. 

 Tharyx parvus Hartman, 1954a, p. 11. 



Collections. San Francisco Bay, California, in intertidal mud flats 

 (many). 



Length 10 to 15 mm. Color in life is dark reddish brown with the 

 cardiac body visible as a very dark brown body in the middle two thirds 

 of the length of the body. The prostomium lacks eyespots. Lateral 

 branchiae emerge from the body at the upper end of the notopodial ridge. 

 Setae are entirely capillary, with the notopodial setae somewhat longer 

 than the neuropodial ones. 



Tharyx parvus is known from western Canada south to California, 

 and is well represented in San Francisco Bay, where it occupies vertical 

 burrows in mud flats. 



Tharyx tesselata Hartman, 1960 



Tharyx tesselata Hartman, 1960a, pp. 126-127, pi. 11, figs. 1-4. 



Collections. Southern California, in subintertidal depths to basin 

 levels (Hartman, 1960a). 



Length is 40 to 55 mm. The body is broadest in its anterior third and 

 ends posteriorly in an inflated end. When mature a tesselated tube en- 

 velops the body, which becomes reddish purple in color. 



It has been found common in southern California, in shelf and slope 

 to basin depths. 



Tharyx monilaris Hartman, 1960 



Tharyx monilaris Hartman, 1960a, pp. 127-128, pi. 12, figs. 1, 2. 



Collections. Southern California, in .shelf to basin depths (many). 



This is an unusually small form, measuring only 3 to 6 mm long. 

 It is very slender throughout most of its length except that the anterior 

 region and the prepygidial segments are inflated, much as in Tharyx 

 tesselata (above). When mature the middle and posterior segments are 

 moniliform, with gonadial products maturing from behind and segments 

 probably shed as ova ripen. There is no investing tube such as is charac- 

 teristic of T. tesselata. 



Tharyx monilaris is common in southern California, in subintertidal 

 to basin depths, in silty and mixed sediments. 



