186 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



specimens, including notopodial hooked setae beginning on setiger 4, 

 ventral cirri lacking on setiger 2 ; segmental intestinal caeca especially 

 prominent. 



Distribution: Off New England, Chesapeake Bay, Gulf of Mexico 

 (Texas), northeastern South America, southern California. Inter- 

 tidal to 2800 fms. 



Sigambra bassi (Hartman) 



Figure 16 



Ancistrosyllis bassi Hartman, 1945, p. 15; 1947, p. 501, pi. 61, figs. 1-7; 1951, 

 p. 36, pi. 11, figs. 1-6. 



Material examined: Paratype from Florida, N 1713, loan from Olga 

 Hartman (AHF). Seahorse Key, Fla., Oct. 1960, J. Taylor, coll. 



Description: Length to 40 mm., width to 2 mm., segments to 146. 

 Body widest anteriorly, tapered posteriorly, flattened dorsoventrally, 

 with parapodia deeply cut, longer than body width. Color (in life): 

 greenish yellow. Integument smooth, without papillae. Prostomium 

 with biarticulate palps with large palpophores indistinctly separated 

 from prostomium and small button-like palpostyles; median antenna 

 on posterior part of prostomium extending far beyond palps; lateral 

 antennae slightly more anterior to median antenna, extending little 

 beyond palps. Tentacular segment longer than following ones, with 

 2 pairs of tentacular cirri similar to lateral antennae. Dorsal cirri of 

 first setigerous segment long, similar to median antenna. Parapodia 

 subbiramous; notopodia low conical, with notoaciculum curving dis- 

 tally, with stout notopodial hooked notoseta beginnmg about setiger 

 14 (11-15); occasionally additional single emergent notoseta, straight 

 or slightly curved (called an aciculuni by Hartman); dorsal cirri long, 

 subulate, extending far beyond setal lobes. Nem-opodia conical, with 

 neuroaciculum and numerous neurosetae; neurosetae variable in 

 length, all endmg in capillary tips, longer ones slender, smooth or 

 faintly serrated, shorter ones serrated; ventral cirri extending slightly 

 beyond setal lobes, lacking on setiger 2. Pygidium with paired long 

 anal cirri. Proboscis cylindrical, with circlet of 14 conical papillae 

 distally. 



Distribution: North Carolina, Florida, central and southern 

 California. Intertidal to 18 fms. 



Sigambra wassi, new species 



Figures 17, IS 



The sjDecies is based on two specimens from Chesapeake Bay, off 

 Rappahanock River, collected by Marvin Wass, holotype (incomplete 

 posteriorly) USNM 30988, 37°37.3' N., 75°59' W., sand, 6 fms., 

 June 1962; paratype (broken and in 3 pieces) USNM 30987, 37°37' N., 



