NO. 2 HARTMAN, BARNARD: RENTHIC FAUNA OF DEEP RASINS 127 



Mature, ovigerous individuals are frequently taken in a closely adher- 

 ing mucoid tube with tesselated lateral processes, through the ends of 

 which the branchial filaments extend. These tubes extend the full length 

 of the body or beyond, and the anterior end of the body seems to be 

 extensile from it (Plate 11, fig. 1). Immature stages have thin, less 

 developed mucoid sheaths which are easily torn away. The specific name 

 refers to the character of the tube. 



Tharyx tesselata may be compared with Tharyx sp. Berkeley and 

 Berkeley (1941, p. 45) from southern California, which it resembles in 

 the character of the neuropodial setae with serrated blade. However, in 

 the latter the anterior achaetous region has 4 segments and the fifth seg- 

 ment is the first setigerous. 



T. tesselata is one of the most abundant species of polychaetes in the 

 basins of southern California, as well as on the slope and shelf. 



Tharyx monilaris, new species 

 (Plate 12, figs. 1, 2) 



Specimens so identified come from Santa . Catalina, Tanner and 

 questionably San Nicolas and Long Basins. The species is described from 

 specimens from shallower depths, where it is expected to have its most 

 abundant distributions. The type is selected from Sta. 4723, off Newport 

 Beach, in 128 fms, silt. It is ovigerous and probably mature. The body 

 is very slender, moniliform in most of its length, and measures about 

 18 mm long. Other similarly developed individuals are somewhat smaller 

 or larger but all are distinctly moniliform in median and posterior seg- 

 ments. Segments number 100 or more. The prostomium is acutely pointed 

 triangular; a pair of spots near its base and at the sides, may represent 

 eyespots. The buccal region is inflated, resembling the far posterior end 

 in which the segments are closely crowded and also inflated (Plate 12, 

 fig. 1). 



Parapodia are lateral throughout, with setal fascicles emerging from 

 a slightly elevated parapodial papilla. All setae are slender, distally 

 pointed, hairlike; neuropodial setae are shorter than the corresponding 

 dorsal ones but otherwise similar. The lateral branchiae are inserted 

 adjacent to the notopodial lobe. In ovigerous segments they are near the 

 posterior end of the segment, behind the inflated region. 



The first 15 setigerous segments are short and closely crowded. 

 Abruptly thereafter they are longer and cylindrical to beadlike. 



A fully mature, epitokous individual from Sta. 5586, 10.3 mi from 



