COMPLETE HARTMANI POLYCHAETES FROM CALIFORNIA 65 



but they may have exceeded in length the other processes. Neuropodia 

 are long, have a compressed base and are directed laterally. The presetal 

 lobe is extended laterally as a triangular lobe at the upper edge of the 

 neuropodium ; the postsetal portion is short, truncate, flangelike behind 

 the setal series. All setae are composite, falcigerous, with the uppermost 

 the longest and the lowermost gradually becoming shorter. The setal 

 appendage is falcate, distally bifid with the lateral tooth some distance 

 below the main fang and directed obliquely outward. The longest ap- 

 pendages are about twice as long as the shortest, but similar in other 

 respects. 



The species of Orseis are readily distinguished from other hesionids 

 because parapodia are present from the second visible segment. The type 

 of the genus, O. pulla Ehlers (1864, p. 188) from the Mediterranean 

 Sea, is poorly known (see Fauvel, 1923, p. 248). O. mathai Gravier 

 (1906, p. 386, and 1907, p. 22) comes from Port Charcot, Antarctica, 

 in about 40 m. It most nearly resembles the species from California 

 but is much smaller, measuring 3.6 mm long and consisting of only 

 18 setigerous segments; it has much shorter cirri and composite falcigers 

 have comparatively much longer appendages. O. fimbriate! Hartman 

 (1953, p. 18) from South Georgia, has fimbriated nuchal processes. 



Orseis lagunae has been taken only at Laguna Beach, California, in 

 intertidal areas. 



Genus Amphiduros Hartman, 1959 

 Type A. setosus (Hessle) 1925 



Amphiduros replaces Amphidromus Hessle (1925) which is pre- 

 occupied. Parapodia are distinctly biramous. The prostomium has 3 

 antennae and 2 pairs of eyes in trapezoidal arrangement. The paired 

 palpi are ventral. The eversible proboscis is smooth, unarmed, lacks 

 papillae but terminates distally in a circlet of fimbriae. The buccal region 

 is provided with 8 pairs of tentacular cirri. 



Amphiduros pacificus, new species 

 Plate 4, figs. 1-4 



Collections. Stations 1441 (type), 1493 (2), 4788 (3), and other 

 areas of southern California, in shelf depths. 



This is a small, fragile species. Length of 32 segments is 16 mm; 

 width 2 mm without and 4 mm with parapodia. Specimens are usually 



