28 U.S. NATIONAL MUSEUM BULLETIN 22 7 



Distribution. — Arctic Alaska, Bering Sea, north Japan Sea, 

 Labrador to Massachusetts. In low water to 123.5 fathoms. 



Genus Gattyana Mcintosh, 1897 



Nychia Malmgren, 18G5, preoccupied by St§,l (1859, Hemiptera) ; t3'pe (mono- 

 typy): Nychia cirrosa (Pallas, 1766). 



All 3 species with 15 pairs of elytra, overlapping, covering the 

 dorsum; elytral surface covered with numerous micro tubercles and 

 lateral fringes of papillae. Prostomium with distinct cephalic peaks, 

 anterior pair of eyes anteroventral, not visible dorsally. Upper 

 notosetae stouter, curved, with blunt tips; rest end in fine to capillary 

 tips. Neurosetae with distal spinous regions and entire, slightly 

 hooked tips. Color: variable, tan, tan mottled with brown, with 

 or without a darker spot near elytrophore, with or without a darker 

 streak middorsally. 



Key to the New England Species of Gattyana 



1. With some larger conical macrotubercles in addition to the microtubercles 



(fig. 5a) G. nutti 



Without conical macrotubercles 2 



2. Elytral microtubercles 1 to 4 pronged (fig. 5b). Lower neurosetae with 



the bare distal tips not longer than the spinous regions (fig. 5d). 



G. cirrosa 

 Elytral microtubercles conical and bifid (fig. 5e). Lower neurosetae with 

 the bare tips as long as or longer than the spinous regions (fig. 5g) . 



G. anioudseni 



Gattyana cirrosa (Pallas, 1766) 



Figure 5,b-d 



Nychia cirrosa Verrill, 1881, pp. 306, 311. — Webster and Benedict, 1884, p. 700; 

 1887, p. 708.— Whiteaves, 1901, p. 86. 



Gattyana cirrosa Fauvel, 1923, p. 49, fig. 17, a-/. — Procter, 1933, p. 135. — Tread- 

 well, 1948, p. 19, fig. 76.— Miner, 1950, p. 307, pi. 100.— Pettibone, 1953, 

 p. 41, pi. 20; 1954, p. 226, fig. 266; 1956a, p. 551.— Davenport, 1953, p. 169. 

 Newell, 1954, p. 333.— Uschakov, 1955, p. 143, fig. 31.— Southward, 1956, 

 p. 257.— Clark, 1960, p. 11.— Eliason, 1962, p. 217. 



Description. — Length up to 47 mm., width including setae up to 

 12 mm., segments 35-38. Elytral microtubercles simple, bifid or 

 quatrifid, the latter especially characteristic (not so prominent when 

 commensal). Elytra with long papillae scattered on the surface 

 as well as on the external borders, usually covered with debris, giving 

 a straggly appearance. 



Biology. — Dredged on various combinations of mud, sand, pebbles, 

 gravel, with shells, sponges, algae, mud tubes. Found at low water 

 on rocky ledges with muck, on rocks in encrusting calcareous algae. 

 Single specimen found among the fouling organisms on buoys, etc., 



