130 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.15 



above) and separated from it for its different size. Since the latter is a 

 Nepthys with recurved interramal cirri, the 2 are at once separable. 

 The so-called jointed setae described by Baird (1873, p. 95) may have 

 referred to the preacicular barred setae, but these were further mis- 

 interpreted to be postacicular, instead of preacicular in position. 



Other specimens examined, labeled Nepthys virgini Ehlers (1897, 

 pp. 19-23, pi. 1, figs. 9-12) also from Patagonia and now deposited in 

 the Swedish State Museum, resemble the specimen of Baird. Some 

 neuropodia have an erect lobe on the superior edge; interramal cirri are 

 involute and first present from segment 4 or 5 ; the first are small but 

 by segment 5 these cirri are longer than their respective notopodial cirri. 

 The latter are foliaceous but have an acuminate tip. Anterior neuro- 

 podia have a short, superior digitate lobe that attains its maximum 

 development at about segment 10-15. The proboscis has 14 rows of sub- 

 terminal papillae; at the proximal end of the series each row bifurcates 

 to give rise to 2 or more rows of smaller papillae. 



A. lutreus bears resemblance to A. sinensis (Fauvel) (1932b, p. 

 536) which also has 14 rows of subterminal papillae on the proboscis 

 and a superior lobe on neuropodia. However, in the latter interramal 

 cirri are present from the second segment and already well developed 

 by the third one. 



Distribution. — A. lutreus (Baird) is known only from Patagonia, 

 southern South America. 



Genus Micronephthys Friedrich, 1939 

 Type M. minuta (Theel) 



This genus was erected (Friedrich, 1939, p. 123) for a single species, 

 Nephthys minuta Theel (1879, pp. 28-31, pi. 2, fig. 18) from the 

 Russian Arctic Sea. It is characterized for its small size (16 to 19 mm 

 long or less) and few body segments (as low as 30 but perhaps to 75 

 or more) and perhaps for nearly or altogether lacking interramal cirri. 

 Parapodial lobes are poorly developed. Setae consist of barred pre- 

 acicular, and smooth lanceolate postacicular ones. Furcate setae are 

 known only for one species, here referred to this genus, M. sphaero- 

 cirrata (Wesenberg-Lund). The first segment, like all subsequent ones, 

 is biramous. 



In addition to the type species of the genus, M. minuta (Theel), the 

 genus may include also the following species: Nephthys abranchiata 

 Ehlers (1913, p. 452) from Antarctic seas in 385 meters, and Nephthys 

 ambrizettana Augener (1918, pp. 166-168, pi. 2, fig. 13, pi. 3, figs. 60, 



