110 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



8. Branchiae increase in length posteriorly; posterior neuropodial 

 hooks with a pointed hood .... Aricidea lopezi 



8. Branchiae do not increase noticeably in length posteriorly; pos- 

 terior neuropodial hooks without a hood . Aricidea nr suecica 



Genus PARAONIS Grube, 1872 



Paraonis gracilis (Tauber) 1879 

 Hartman, 1957, pp. 330-331, pi. 44, figs. 4, 5. 



This species is present in nearly all basins, and perhaps throughout 

 the benthos of southern California, in sediments of fine silt. Specimens 

 are usually so very small and slender that they can pass through sorting 

 screens or even be overlooked in microscopic sorting. Specimens taken 

 from the basins usually have branchiae present from the fifth parapodium 

 and they number only 6 to 12 pairs. 



Paraonis gracilis is recorded from cosmopolitan areas (Hartman, 

 1957, p. 331) and it may be eurybathic as well. It occurs frequently in 

 shallower bottoms of southern California (unpublished records). 



Paraonis gracilis oculata Hartman, 1957 

 Hartman, 1957, pp. 331-332, pi. 44, figs. 1-3. 



Specimens come largely from San Pedro, Santa Monica, Santa Cata- 

 lina and Santa Cruz Basins and the San Diego trough. Like the stem 

 species, they are smaller, have fewer than the typical numbers of bran- 

 chiae. The prostomium has a pair of eyespots and so differs from that of 

 the stem species found in the basins. This is known from eurybathic 

 benthos of southern California. 



Paraonis multibranchiata Hartman, 1957 

 Hartman, 1957, pp. 332-333. 



This species has been found only in Santa Barbara Basin. It is char- 

 acterized by having branchiae present from the sixth setigerous segment 

 and they number 26 or more pairs. 



Genus ARICIDEA Webster, 1879 

 Aricidea uschakovi Zachs, 1925 

 Hartman, 1957, p. 321, pi. 43, fig. 5. 



This species has been taken in most of the subsill parts of the basins 

 and may be expected to be widely distributed throughout the northeast 



