328 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



Distribution. — Aricidea 7{Aedicira) ramosa comes originally from 

 Bay of Peter the Great in 44 to 2400 meters ; the present record is from 

 the eastern wall of Catalina Basin, California, in 1034 meters. 



Genus Paraonis Grube, 1878 



The prostomium is semicircular or conical and more or less de- 

 pressed ; it has or lacks eyes; a median antenna is absent. The first (rare- 

 ly the second) segment is the first setigerous one. Branchiae are present 

 from the fourth or not before the eleventh to nineteenth segment ; they 

 number 3 to 36 or more pairs. The posterior abranchiate region of the 

 body is usually cylindrical, has poorly marked segmental grooves and 

 inconspicuous parapodia. Notopodia have only slender hairlike setae; 

 neuropodia have hairlike setae in anterior segments; in the abdominal 

 region some have modified setae which may be acicular or uncinate, with 

 or without a terminal sheath or hood. 



The genus is conveniently divided into two lesser groups, Paraonis, 

 sensu stricto in which posterior neuropodia have modified setae, and 

 Paraonis (Paraonides) in which posterior notopodia have setae of char- 

 acteristic form. 



Paraonis, sensu stricto Cerruti, 1909, was erected for Paraonis 

 tenera Grube (1878), even though this species is very incompletely 

 known (Fauvel, 1927a, p. 72). The genotype is more acceptably P. 

 gracilis (Tauber) 1879, which has been considered close to, if not the 

 same as, P. tenera Grube. 



Key to Species of Paraonis, sensu stricto 



1. Setae first present from the second visible segment . P. dubia 



1. Setae first present from the first segment 2 



2. Modified neuropodial setae distally hooded 5 



2. Modified neuropodial setae without distal hood ... 3 



3. Posterior neuropodial hooks terminating in an acute process 

 with a sheath (Fauvel, 1927a, fig. 24k) . . P. fulgens 



3. Posterior neuropodial hooks without a distal process . . 4 



4. Prostomium without eyes 6 



4. Prostomium with eyes (pi. 44, fig. 1) . P. gracilis oculata 



5. Branchiae numbering only 4 pairs . . P. paucibranchiata 



5. Branchiae numbering about 16 pairs ... P. ivanovi 



6. Branchiae number 28 to 36 pairs and are very long . 

 P. multibranchiata 



6. Branchiae number 3 to 12 pairs P. gracilis 





