NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 95 



319), 4 longer, slender, limbate setae above. The pectinate setae are pres- 

 ent after the twenty-fifth setiger; they are fine, delicate, with a distal, 

 expanded end that is somewhat asymmetrical, slightly oblique; they are 

 provided with about 8 or 9 rather widely spaced dentations; only 2 or 

 3 are present in a parapodium and they are nowhere conspicuous. 



Branchiae are present from the twenty-ninth or thirtieth setiger, as 

 a single, slender filament, exceeding in length their respective dorsal 

 cirri ; they are continued farther back as a single filament to the ends of 

 the pieces. 



The proboscidial parts are exceedingly small and delicate; the parts 

 are thin, translucent. The mandibles can be distinguished only as a pair 

 of dark brown, geniculate streaks, somewhat chitinized, the whole not 

 much longer than the maxillary carriers, and the distal bent portion 

 nearly % as long as the basal portion. The maxillae are also delicate; 

 the carriers are longer than wide, basally pointed, laterally slightly in- 

 cised (pi. 15, fig. 316), attached to the falcate forceps. Maxillary plates 

 are strongly dentate, their arrangement about as follows : on the left side 

 maxilla II has 7 teeth. III has 9 or 10 teeth, IV has 7 teeth, V has a 

 single tooth. On the right side, maxilla II has 9 teeth, III (fused with 

 IV) has 7 teeth, and V has a single tooth. 



The unique features of this subspecies are in the setal structures. The 

 anterior hooks are tridentate; composite spinigers are present; some an- 

 terior segments have simple, acicular, tridentate hooks, and acicula are 

 distally bulbous in some segments. The distribution of setal structures 

 for some typical parapodia is indicated (pi. 15, figs. 315, 321). 



Holotype. — AHF no. 43. 



Type locality. — San Clemente Island, California, in 20 fms. 



Distribution. — San Clemente Island, California. 



