POLYCHAETE WORMS, PART 1 35 



4. Elytra with few scattered microtubercles mostly on anterior half of elytra 



(fig. 8g). All neurosetae with tips bifid (with secondary tooth). 



H. dearborni (p. 38) 

 Elytra with microtubercles more numerous 5 



5. With a distinct nuchal fold posterior to prostomium (fig. 8d). Neurosetae 



with large secondary tooth at base of long bare tip (fig. 8/). 



H. macginitiei (p. 39) 



Without distinct nuchal fold. Neurosetae with tips entire (fig 9/) or with 



secondary tooth close to tip (fig. 7d) 6 



6. Elytra with microtubercles only, short conical to elongate conical or spinelike 



(fig. 9e) . Neurosetae with short bare entire tips (fig. 9/) . 



H. (Eunoe) spinulosa (p. 42) 

 Elj'tra usually with additional macrotubercles. Microtubercles not spine- 

 like. Neurosetae with longer bare tips, with or without secondary tooth or 

 remnant of one 7 



7. Elytra with soft macrotubercles near posterior border, wider at base, not 



sharply set off from elytral surface (fig. 9^) H. fragilis (p. 39) 



Elytra with soft macrotubercles (may be absent), globular, sausage shaped 

 or elongate, rodlike, not wider at base and sharply set off from elytral 

 surface (fig. 8,5, c) H. (Lagisca) extenuata (p. 41) 



8. Elytra with macrotubercles confined to single row near external border, nodu- 



lar, with roughened tips (fig. 9b). Extra rounded lobes on inner sides of 

 elytrophores and dorsal tubercles (lobes corresponding to elytrophores on 



non-elytra-bearing segments; fig. 9a) H. (Eunoe) nodosa (p 44) 



Elytra with macrotubercles branched, scattered on elytral surface (fig. 9d). 

 Without extra rounded lobes on inner sides of elytrophores and dorsal 

 tubercles H. (Eunoe) oerstetli (p. 44) 



Harniothoe (Hertnaflion) acanellae (Verrill, 1881) 



Figure 6,l,m 



Polynoe (Eunoa) acanellae Verrill, 1881, pi. 6, fig. 5; 1885a, p. 525, pi. 39, fig. 172; 



1885b, p. 424.— Hartman, 1942b, p. 27, figs. 27-31; 1944a, p. 337, pi. 14, 



fig. 9; 1959a, p. 98.— Miner, 1950, p. 302, pi. 99. 

 Harniothoe acanellae Ditlevsen, 1917, p. 27, pi. 1, figs. 6, 8-9, 13, pi. 2, fig. 4. — 



Wesenberg-Lund, 1950a, p. 7; 1951, p. 15. 



Description. — Length up to 90 mm., width mcludmg setae up to 

 15 mm., segments 50-80. Elytra 15 pau's, easily deciduous, large, 

 cover dorsum except for middorsum and posterior end, elongate oval, 

 thin, translucent, appearing smooth but provided with numerous 

 close-set conical microtubercles, without fringe of papillae, pale 

 3^ellowish white and more or less speclded with orange brown. Pj-osto- 

 mium with 4 large eyes, subequal, visible dorsally, with distinct 

 cephalic peaks. Notopodia and ncuropodia with prolonged slender 

 acicular lobes. Notosetae few in number (4-10), stout, with rather 

 long bare acute tips. Neurosetae with long spinous regions and long 

 bare hooked tips. Proboscis large, dark purple. 



Biology.' — Dredged mostly in deeper waters, associated with 

 corals. They have been found living commensally among the branches 

 of the horny coral Acanella arhuscula (J. Y. Johnson), where they 



