70 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



simple and uniquely dentate (PI. 5, fig. 3). Neuropodial setae are 

 composite falicigerous, with the appendage (PI. 5, fig. 4) of varying 

 lengths; the longest are in supra-acicular and the shortest in subacicular 

 position. 



Oxydromus brunnea has been taken from moderately deep bottoms 

 off southern California, in sediments of rock, gravel and mixed debris; 

 it is associated with ophiuroids, holothuroids, a sabellarian, Sabellaria 

 ce?nentarium, and rock-inhabiting species. 



Family SYLLIDAE 



This family is well represented in California, but the species are 

 mainly poorly known and others may remain undescribed. A few are 

 newly named below. 



Key to Genera and Species 



1. Body extremely depressed; all cirri subspherical 



Plakosyllis americana 



1. Body otherwise 2 



2. Palpi absent; body very small, parasitic on ampharetids 

 Calamyzas famphictenicola 



2. Palpi present ; not known to be parasitic 3 



3. Without ventral cirri 



Autolytus varius and Autolytus spp. 



3. With ventral cirri 4 



4. Dorsal cirri articulated 6 



4. Dorsal cirri not articulated 5 



5. Overall size small, length 4 mm or less; palpi fused 



EXOGONINAE 10 



5. Body larger; palpi present and not fused. EUSYLLINAE 12 



6. Pharynx sinuous Campesyllis minor 



6. Pharynx straight 7 



7. Body depressed ; pharynx with a chitinous, coarsely denticulate 

 crown or trepan ; dorsal cirri with many short articles 

 Trypanosyllis spp. 



7. Body not greatly depressed ; pharynx armed with a chitinous 

 tooth 8 



8. Setae entirely simple; usually in sponges 



Haplosyllis spongicola var. 



