146 PROCEEDINGS OF THE NATIONAL MUSEUM vol.85 



NEPHTYS DIBRANCHIS Gmbe 



Nephthys dihranchis Grube, 1878. p. 536.— McIntosh, 1885, p. 161 (New 

 Guinea). — Augeneb, 1922, p. 17 (Ecuador, New Zealand). — Monko, 1933, 

 p. 56 (Gorgona Island). 



Wephthys mirasetis Hoagland, 1920, p. 610 (Philippine Islands). 



Parapodial arrangement agreeing with that described by Augener 

 (1922) and Monro (1933). Proboscis provided with 22 rows of 

 papillae as described by Monro, 7 or 8 papillae in each row. Entire 

 proboscis minutely and closely covered with prickles. Readily dis- 

 tinguished by its involute recurved cirri, its lyre setae, and the type 

 of structure of the presetal and postsetal lamellae. 



Numerous specimens from Albatross station 2838 (1888), off Lower 

 California, in 44 fathoms. This is the northernmost record for 

 N. dibranchis. Its range is hereby extended to include probably 

 also the Philippine Islands (Hoagland). 



Discussian. — Monro (1933, p. 66) has already commented on the 

 discrepancies in the descriptions of N. dihranchis as given by Mc- 

 intosh (1885, pp. 161, 163) and Augener (1922, p. 18) and of indi- 

 viduals he described from Gorgona Island. The description of 

 N. mirasetis Hoagland (1920, p. 610) presents other difficulties in 

 that lyre setae were not described for it. These may have been 

 overlooked. Its proboscis has 22 rows of papillae (Hoagland, 

 pi. 48, fig. 5), agreeing therein with the individuals described from 

 Gorgona Island and Lower California. The parapodial arrange- 

 ment of N. mirasetis (pi. 48. fig. 6) agrees Avell with that for 

 A^ dibranchis Grube. 



NEPHTYS MAGELLANICA Augener 



FiGtmE 62 



Nephthys mayeUanica Avgener, 1912, p. 208. 



Nephthys cirrosa var. Ehlebs, 1901, p. 67 (mo?) Elilers, 1864-68, p. 624) and 



N. longosetosa Ehlers, 1901, p. 67 {non 0rsted, 1843, p. 195). {Fide 



Augener, 1912, p. 208. ) 

 Nephthys incisa Tbeadwell, 1914, p. 193. (Non Malingren, 1865, p. 105.) 



Additional description. — Length to 100 nmi; number of segments 

 120-150. Prostomium as in figure 62, a. Recurved cirri present 

 from third setiger, these never long (fig. 62, b-d), at most extending 

 to near middle of parapodia, and only slightly curved outward. 

 Median dorsal papilla of proboscis similar to the larger paired sub- 

 terminal papillae. Proboscis smooth on its proximal part. Setae 

 long, silky, somewhat flowing or recumbent at sides. 



Distribution. — San Diego Bay, southern California; the Straits 

 of Magellan and Chile (Augener). 



Discussi-on. — Augener (1912, p. 210) indicated the affinities of N. 

 iimgellanica with N. cirrosa Ehlers, stating that the former may be 



