288 U.S. NATIONAL MUSEUM BULLETIN 227 



Material examined. — Off Massachusetts to off Long Island 

 Sound, Albatross Stations, 788 to 1,061 fathoms. 



Distribution. — ^Deep Atlantic off Massachusetts to off Long Island 

 Sound. In 788 to 1,061 fathoms. 



Scoloplos {Scoloplos) riseri Pettibone, 1957a 



Figure 74, e,/ 

 Scoloplos (Scoloplos) riseri Pettibone, 1957a, p. 163, fig. 2. 



Description. — ^Length? (more than 55 mm.), width up to 3 mm., 

 segments numerous. Prostomium elongate conical, longer than wide, 

 may be wrinkled, appearing biannulate, with a pair of inconspicuous 

 eyes. Branchiae begin on about setiger 10 (8-10). Thoracic setigers 

 about 19. Thoracic neuropodia with dense fan-shaped bundles of 

 neurosetae, including several rows of crotchets (blunt tips) and some 

 tapering to fine tips (fig. 74e). 



Abdominal region with paired branchiae, with long lanceolate 

 postsetal notopodial lobes, with digitiform interramal cirri (begin 

 on about setiger 18, continuing for about 70 segments), with bilobed 

 neuropodia. Transitional region with 1-2 extra postsetal neuropodial 

 papillae (posterior 9 or so thoracic segments), with 1-9 or so subpodal 

 ventral or stomach papillae on setigers 14-24 (last 6 thoracic, first 

 5 abdominal), with 2 subpodal conical papillae continuing on rest of 

 body (fig. 74/). 



Biology. — Found intertidally in sand with shells. 



Material examined. — Type from Woods Hole, Massachusetts. 

 Florida (Seahorse Key, west lagoon, J. Taylor, collector). 



Distribution. — Massachusetts (Woods Hole region). Gulf of Mex- 

 ico (Florida). Low water. 



Scoloplos (Scoloplos) robustus (Verrill, 1873a) 



Figure 76g 



Anthostomarobuslum Verrill and Smith, 1874. pp. 49, 54, 71, 134, 303, pi. 14, fig. 76. 

 Scoloplos robustus Verrill, 1881, pp. 301, 317. — Andrews, 1891a, p. 292. — Sumner, 



Osburn, and Cole, 1913, p. 624. 

 Scoloplos robusta Webster and Benedict, 1884, p. 724. 

 Scoloplos bustorus Hartman, 1942b, p. 58, figs. 110-112. 

 Haploscoloplos bustorus Hartman, 1945, p. 30. 

 Haploscoloplos bustoris Horn and Bookhout, 1950, p. 1, pis. 1-4. 

 Haploscoloplos robustus Hartman, 1951, p. 78, pi. 21, figs. 4-6; 1956, pp. 258, 268, 



290; 1957, p. 272, pi. 25, figs. 4^6. 



Description. — ^Length up to 375 mm., width up to 10 mm., seg- 

 ments up to 300. Prostomium acutely conical, longer than wide. 

 Branchiae begin on about setiger 24 (16-32). Thoracic setigers about 

 23 (15-33). Thoracic neuropodia with dense fan-shaped bundles of 

 neurosetae all ending in fine tips, without crotchets. 



