NO. 3 HARTMAN : ORBINIIDAE, APISTOBRANCHIDAE, PARAONIDAE 333 



simple, distally pointed, slightly limbate setae in spreading fascicles. The 

 next 28 to 36 branchial segments are narrower and more depressed ; their 

 parapodia resemble those in front and they are provided with setae of 

 like kind, but in less conspicuous bundles. 



Branchiae are simple, cirriform to threadlike; the first few are short 

 and they increase in length, becoming long and threadlike, and appearing 

 tangled. Their corresponding segments are at first short, annulate and 

 crowded, then longer. Those of the postbranchial region are long and 

 cylindrical, about twice as long as wide. 



Notopodia of the postbranchial region are inconspicuous and papillar ; 

 they have 3 or 4 slender capillary setae in an inconspicuous fascicle. The 

 corresponding neuropodia have larger bundles of curved, acicular setae 

 alternating with an equal number of slender, longer pointed setae; they 

 number about five sets in a bundle. The acicular setae are distally blunt, 

 without a hood ; the uppermost in a series are longest but all are about 

 equally thick. The posterior end of the body terminates in a dorsal anal 

 pore, followed by a small triangular lobe with a pair of very slender, 

 short cirri, about as shown in PL 44, fig. 2. 



P. multibranchiata differs from other species of the genus in having 

 28 to 36, instead of 3 to 20, pairs of branchiae; it is known to occur 

 only in deep, instead of shallow, water. 



Distribution. — This is known only from Santa Barbara Channel 

 Basin, California, in 260 to 305 fathoms. 



Paraonis ivanovi Annenkova, 1934 



Paraonis ivanovi Annenkova, 1934, p. 656, fig. 1A. 



The prostomium is conical and has no eyes ; nuchal organs are in the 

 shape of a horseshoe. Branchiae are first present from the fifth setigerous 

 segment and number 16 pairs; they are lancet-shaped. Notopodial post- 

 setal lobes of anterior segments are short ; those of abdominal segments 

 are long and slender. Setae of notopodia and neuropodia are simple and 

 of similar form throughout except in neuropodia of abdominal segments, 

 where there are hooded uncini, up to 3 in a transverse row. 



Distribution. — Paraonis ivanovi is known only from north of Bering 

 Sea, south of Krusenstern Island, in 1500 to 2000 meters. 



PParaonis dubia (Augener) 1914 



Scoloplos (Naidonereis) dubius Augener, 1914, pp. 31-32, pi. 1, fig. 5, 



text-fig. 3. 

 Paraonis dubia Augener, 1923, pp. 72-75, fig. 25. 



