POLYCHAETE WORMS, PART 1 41 



Distribution. — Widely distributed in the Arctic. Also Danish 

 seas, Labrador to Massachusetts, southern California, north Japan 

 Sea. In 1 to 1,611 fathoms. 



Harmothoe (Lagisca) exteniiata (Grubc, 1810) 



Figure 8,a-c 



Lagisca rarispina Malmgren, 1865, p. 65, pi. 8, fig. 2. — Verrill, 1881, pp. 311, 

 314.— Webster and Benedict, 1884, p. 700; 1887, p. 709.— Whiteaves. 1901, 

 p. 85. 



Lagisca propinqua Malmgren, 1867, p. 9, pi. 1, fig. B,a-e. — Verrill, in Smith, 

 Harger, and Verrill, 1874, p. 20. 



Lagisca rarispina var. occidentolis Mcintosh, 1874, p. 262, pi. 9, figs. 1-4. Whit- 

 eaves, 1901, p. 86. 



Lagisca impatiens Webster, 1886, p. 129, pi. 4, figs. 1-7. 



Lagisca extenuata Fauvel, 1923, p. 76, fig. 2S,a-m. — St0p-Bowitz, 1948a, p. 11, 

 fig. 7.— Newell, 1954, p. 333.— Hartman, 1959a, p. 84.— Banse, 1959, p. 422.— 

 Clark, 1960, p. 12.— Eliason, 1962, p. 222. 



Harmothoe extenuata Pettibone, 1953, p. 31; 1954, p. 222; 1956a, p. 549. 



Harmothoe rarispina Uschakov, 1955, p. 155, fig. 37. 



Description. — Length up to 74 mm., width including setae up to 

 20 mm., segments 37-47. Prostomium with distinct cephalic peaks, 

 anterior pair of eyes anterolateral, visible dorsally, slightly anterior 

 to widest part of prostomium. Elytra with numerous conical micro- 

 tubercles with tips blunt, pointed or bifid, with short fringe of papil- 

 lae on external border; with or without additional macro tubercles — 

 when present, distinctly set off from the elytral surface, usually nar- 

 rower at the base, translucent to brownish, smooth, globular (var. 

 propinqua, fig. 8,b), sausage-shaped or elongate fusiform (var. rari- 

 spina, fig. 8,c) ; macrotubercles variable in number, 0-9 near posterior 

 border, 0-13 scattered near center of elytron. 



Neurosetae with enlarged long spinous regions, mth tips slightly 

 hooked, wdth small secondary tooth present, as remnant only, or 

 absent entirely (in var. occidentalis and var. impatiens only few 

 neurosetae have a secondary tooth or remnant of one; in some absent 

 entirely). Color: body irregularly pigmented dorsally, somewhat 

 banded, brownish to grajdsh green; elytra variable in coloration, 

 uniformly tan to mottled with brown, red, dark grey, yellow, some- 

 times with a darker or yellow spot near the elytrophore. 



Biology. — An abundant and widely distributed species in the 

 Arctic, North Atlantic, and North Pacific, found both intertidally 

 and dredged at considerable depths. Often associated with two 

 other common northern polynoids — Lepidonotus squarnatus and 

 Harmothoe imbricata (often confused and lumped with the latter spe- 

 cies). Intertidally found under rocks, in rock}^ tide pools with algae, 

 sponges, etc., in encrusting calcareous algae, among holdfasts and 



