NO. 3575 BATHYAL POLYNOIDS — PETTIBONE 3 



Admetella hastigerens Chamberlin, 1919, p. 64, pi. 9, figs. 6-8. — Treadwell, 1923, 



p. 3. 

 Admetella dolichopus Chamberlin, 1919, p. 67, pi. 10, fig. 1. 



Remarks: The following study is based on 12 specimens in the 

 U.S. National Museum, collected from seven Albatross stations from 

 the vicinity of Hawaii, Philippine Islands, and Lower California to off 

 Central America. The specimens were identified by Treadwell as 

 Polynoe mirahilis Mcintosh (TreadweU, 1906, 1920) and Admetella 

 hastigerens Chamberlin (TreadweU, 1923) and by Chamberlin (1919) 

 as 2 new species of Admetella, A. hastigerens, and A. dolichopus. AU 

 of the above are herein referred to Admetella longipedata (Mcintosh) . 

 Fauvel (1914, p. 39) questioned the identification by Treadwell (1906, 

 p. 1149) of Polynoe mirahilis from off Hawaii. Uschakov (1950, p. 

 157) also questioned the identifications in both records of TreadweU 

 (1906, 1920). Eliason (1951, p. 133) questionably referred A. hasti- 

 gerens to A. longipedata. 



Material examined: From seven Albatross stations, Sta. 2635 

 (Apr. 18, 1891), off Mexico, 20°47' N, 106°15' W, 2022 fms, dark 

 green mud (USNM 19325, type of Admetella dolichopus Chamberlin) ; 

 Sta. 4022 (June 21, 1902), vicinity of Kauai, Hawaiian Islands, 374- 

 899 fms, coral, sand, foraminifera, rock (USNM 5458, identified by 

 Treadwell as Polynoe mirahilis, 2 spec); Sta. 4621 (Oct. 21, 1904), 

 southwest coast of Central America, 6°36' N, 81°45' W, 581 fms, 

 green sand (USNM 19326, type of Admetella hastigerens Chamberlin) ; 

 Sta. 5114 (Jan. 20, 1908), Balayan Bay and Verde Island Passage, 

 PhUippine Islands, 13°36' N, 120°45' E, 340 fms, fine sand (USNM 

 17507, identified by Treadwell as Polynoe mirahilis, 5 spec); Sta. 

 5122 (Feb. 2, 1908), east coast of Mindoro, PhUippine Islands, 13°2r 

 N, 120°30' E, 220 fms, green mud (USNM 17606, identified by Tread- 

 well as Polynoe mirahilis, 1 spec.) ; Sta. 5677 (Mar. 17, 1911), between 

 Ballenas Bay and Santa Maria Bay, Lower California, 25°23' N, 

 113°16' W, 735 fms, green mud, fine sand (USNM 19149, by Tread- 

 well as Admetella hastigerens, 1 spec); Sta. 5685 (Apr. 22, 1911), 

 south of Abrejos Point, Lower California, 25°42' N, 113°30' W, 

 645 fms, black sand, coral (USNM 19150, identified by TreadweU 

 as Admetella hastigerens, 1 spec). 



Description: Length 50 to 100 mm; width, including parapodia 

 (without setae), 16 to 35 mm; segments 64 to 82, last 4 to 6 very small. 

 Body spincUe shaped, mdest in middle, tapering anteriorly and 

 posteriorly, arched dorsally, flattened ventraUy. Parapodia very long, 

 as long as width of body, inflated and flattened transversely (fig. Ic). 

 Elytra (usually missing) on large inflated elytrophores, 25 to 31 pairs, 

 arranged on segments 2, 4, 5, 7, then alternate segments to 23, and 



