330 allan hancock pacific expeditions vol. 7 



ICey to American Species of PECTINARIA (sensu latiore) 



1. Uncini with major teeth in single series ('CiV/^niWejj .... 2 



1. Uncini with major teeth in 2 or more series (Pectinaria) . . 7 



2. Shorter notopodial setae strongly incised (pi. 50, fig. 17) ; sca- 

 phal hooks distally oblique, terminating in a small knob (pi. 50, 

 fig. 11); tubes constructed of very fine, light-colored sand grains 

 C. gouldii 



2. Shorter notopodial setae not incised ; scaphal hooks otherwise . 3 



3. Tube constructed of very coarse sand 4 



3. Tube constructed of moderately coarse to fine sand particles . 5 



4. Scaphal hooks few, only 2 or 3 pairs, distally straight (pi. 50, 

 fig. 10) ; uncini with 10-12 major teeth . . C. re gaits, p. 332 



4. Scaphal hooks 6-10 pairs, distally roundly curved; uncini with 

 only 3 major teeth C. granulata 



5. Tube constructed of moderately coarse, black and white sand 

 grains; uncini typically with 4 major teeth (pi. 50, fig. 14); 

 cephalic spines blunt, short C. brevicoma,ii».3'i\ 



5. Tube constructed of fine sand grains; cephalic spines long, 

 pointed 6 



6. With 13 uncinigerous segments; uncini with 4 major teeth . . 

 C. ehlersi 



6. With 12 uncinigerous segments; uncini with 3 major teeth . . 

 C. hyperborea 



7. Larger, to 46 mm long; with 12 uncinigerous segments; uncini 

 with 7-8 major teeth (pi. 50, fig. 12) in each of 2 rows . . . 

 P. chilensis, p. 333 



7. Smaller, not over 25-30 mm long; with 13 uncinigerous seg- 

 ments; uncini with 5 major teeth in each of 2 rows .... 8 



8. Cephalic spines coppery red; scaphal hooks gently curved (pi. 

 49, fig. 2) ; tubes reddish .... P. calif orniensis, p. 333 



8. Cephalic spines brassy with coppery tinge; scaphal hooks more 

 strongly curved ; tubes grayish . . P. c. newportensis, p. 335 



