POLYCHAETE WORMS, PART 1 39 



Biology. — Found attached to floating gulf weed, as Sargassum, 

 which it matches in coloration. Specimen massed with eggs (Sep- 

 tember 1953, Vineyard Sound). 



Material examined. — Specimens attached to gulfweed, Vineyard 

 Sound, Massachusetts. 



Distribution. — Massachusetts (Vineyard Sound). On floating 

 gulfweed. 



Harmothoe macginitiei Pettibone, 1955 



Figure 8,d-f 

 Harmothoe macginiiiei Pettibone, 1955, p. 122, fig, 4,a-i. 



Description. — Length up to 20 mm., width including setae up to 

 9 mm., segments 36. Body wide, greatly flattened. Elytra large, 

 imbricated, completely covering the dorsum, with numerous micro- 

 tubercles which gradually get larger more posteriorly on each elytron; 

 microtubercles conical, pointed, some bifid, some quadrifid or irregular, 

 with thick fringe of papillae on lateral and posterior elytral borders 

 as well as on surface. Prostomium with cephalic peaks blunt or poorly 

 developed, with 4 small eyes. Setae golden yellow. ISotosetae form 

 a very thick bushy bundle, extending almost as far distally as the 

 neurosetae; upper ones shorter, more arched; rest longer, with rather 

 long bare pointed tips and long spinous rows. Neurosetae with long 

 bare hooked tips and with straight secondary tooth some distance 

 from the tip. 



Biology, — Found intertidally in muddy sand, where it was dug 

 under water. 



Material examined. — Known from a single specimen collected at 

 low tide, Hadley Harbor, Naushon Island, Massachusetts. 



Distribution. — Massachusetts (Elizabeth Islands). Low water. 



Harmothoe fragilis Moore, 1910 



Figure Qg 



Evarne impar Malmgren, 1865, p. 71, pi. 9, fig. 7.— Verrill. 1881, p. 319.— Not 



Polynoe impar Johnston, 1839. 

 Polynoe im.par Thdel, 1879, pp. 9, 15. — Not Johnston, 1839. 

 Harmothoe {Evarne) fragilis Moore, 1910, p. 353, pi. 29, figs. 29, 30, pi. 30, figs. 



31-33. 

 Harmothoe impar Ditlevsen, 1917, p. 12, fig. 1, pi. 2, fig. 16, pi. 3, fig. 11.— Not 



Fauvel, 1923, p. 59, fig. 21,a-/.— Uschakov, 1955, p. 157, fig. 41.— Pettibone, 



1956a, p. 550. — Eliason, 1962, p. 217. — Not Polynoe impar Johnston, 1839. 

 Evarne lla fragilis Hartman, 1959a, p. 75; 1960b, p. 79. 



Description.— Length up to 26 mm., width including setae up to 

 12 mm., segments 37-41. Prostomium with cephahc peaks prominent, 

 eyes large, anterior pair in region of greatest prostomial width. 



