366 PROCEEDINGS OF THE ACADEMY OF [April, 



XVII, high and prominent. Dorsal tubercles rather long and slender. 

 Nephridial papillae thick and very short. 



Acicula rather slender, of usual form. Notopodial setae very few, 

 usually three to six very closely appressed to acicular process, pale 

 yellow, slightly stouter than neuropodials, straight, blunt and with 

 the transverse lines of teeth extremely close, fine and numerous, 

 appearing under 500 diameters as scarcely discernible transverse 

 lines (PI. XXXI, fig. 49). Neuropodials (figs. 50 and 51) numerous, 

 forming dense rather long brushes, colorless and delicate, the ends 

 flattened but not much expanded, the marginal serrations very fine 

 and the point rather acute. Colorless. 



Station 4,407, off Santa Catalina Island, :!.!4-600 fathoms, gray 

 sand and rocks (type only). 



Polynoef?) fllamentosa Bp. nov. PI. XXXI, figs. 52-56. 



Known from a single imperfect and incomplete specimen consisting 

 of 24 setigerous segments, 17 mm. long, the body 2.5 mm. wide and 

 the width between seta tips 8.5 mm. Found with P. remigata and 

 somewhat resembling that species but with the body more slender 

 and the seta? quite different. 



Prostomium unknown, being much macerated and torn and all 

 cephalic appendages lost. No elytra are in place; elytrophores 

 rather small and elevated, farther out on parapodia than on P. remi- 

 gata; borne on the usual somites on the anterior region of the body. 

 Dorsal tubercles very long and slender, especially on posterior segments 

 on which they reach nearly to The ends of thenotocirrophores. Nephri- 

 dial tubercles very short and rather thick and truncated. 



Parapodia (PI. XXXI. fig. 52) closely similar to those of P. remigata, 

 the notopodium not so well separated, more conical and tapered and 

 the acicular process stouter at the base and also more tapered. Noto- 

 cirrophores arise above base of notopodium and are much smaller 

 than in P. remigata. A single style remaining on somite XVIII is 

 remarkable for its great length and tenuity, which may be enhanced 

 by abnormal stretching. It is more than one-half the entire length 

 of the worm or twice the total width of bod)- and parapodia, flagelli- 

 form without subterminal enlargement or sensory cilia. Neurocirri 

 (fig. 52) arise halfway between nephridial papilla? and end of ventral 

 border of neuropodium to which they reach ; they are slender and 

 uniformly tapered. 



Notopodial setae moderately numerous, forming somewhat promi- 

 nent radiating bundles. They are colorless, rather coarse (PI. XXXI, 

 fig. 54) nearly straight, tapering to acute points (fig. 53) and bear 



