100 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



tured (fig. 4) ; the blade is thin and knifelike, provided with a single 

 series of teeth or bracts that extend along the broad portion of the seta 

 but diminish to disappearance at the distal third; the tapering, distal 

 tip is smooth. Furcate setae have not been found. 



N. singularis is characterized especially for its long, thin, foliaceous 

 postsetal lobes in median and posterior segments, and the digitate 

 superior neuropodial lobes of segments 4 to 12; interramal cirri are 

 present from segment 4 where they are already large and continued back 

 through a long region. The prostomium lacks eyespots. The proboscis 

 has 22 rows of terminal papillae, and 22 rows of proximal papillae 

 with 7 to 8 in a series; the proximal surface is smooth; there is no 

 middorsal or midventral one. The species is separable from related ones, 

 as indicated in the key above. 



Holotype. — from station 770 — 38 and paratypes in the Allan Han- 

 cock Foundation. 



Type locality. — Off San Jose Point, Guatemala in 7-11 fms, black 

 sand. 



Distribution. — Near Cabeza Ballena, Gulf of California in 10-15 

 fms and off Guatemala in 7-13 fms, in fine sand. 



Nephtys magellanica Augener 



N. incisa Treadwell, 1914, p. 193. 



N. malmgreni Treadwell, 1914, p. 192, in part. 



N. assimilis Treadwell, 1914, p. 193, in part. 



Hartman, 1940, p. 238, pi. 41, figs. 100, 101; Hartman, 1944b, p. 18. 



Collections not previously reported. — 559-36 (1); 1051-40 (1); 

 1056-40 (1); 1070-40 (1); 1075-40 (4); 1080-40 (1); 1757-49 (1); 

 San Lorenzo Channel, Espiritu Santo Island, Lower California 

 (several); San Pedro, California (12); La Playa, San Diego Bay, 

 and other localities nearby, California (22). 



The following collections reported from parts of southern Cali- 

 fornia have been reexamined and are here referred to Nephtys magellan- 

 ica. They are now in the Allan Hancock Foundation: Nephthys malm- 

 greni Treadwell (1914, p. 192) from Point Loma, La Playa in San 

 Diego Bay, San Pedro Channel, San Pedro, San Diego ; also the follow- 

 ing dredged stations from southern California, XLI-H 1 to 5 and 

 LXXVI-H 1 (for data consult Michael and McEwen, 1915). Others 

 reported as N. assimilis Treadwell (1914, p. 193) come from stations 

 LXXXIX-H 1 and LXXV, and as N. incisa Treadwell (1914, p. 

 193) off La Jolla, California. 



