152 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



Family AMPHARETIDAE 



At least twelve species in nine genera are represented. Species of this 

 family are confused and in need of major revision. Those recorded from 

 the basins of southern California may be identified according to the 

 following key. 



Key to species 



1. With paleae (modified setae) projecting laterally from a peri- 

 stomial region 2 



1. Without paleae 4 



2. Paleae weak, about as thick as thoracic notopodial setae and 

 distally oblique; thorax consisting of 15 setigerous segments 

 M elinnampharete eoa 



2. Paleae stronger, much thicker than thoracic notopodial setae ; 

 thorax consisting of 14 to 17 setigerous segments . . 3 



3. With 14 thoracic setigerous segments .... 6 

 3. With 15 thoracic setigerous segments . Anobothrus gracilis 

 3. With 16 thoracic setigerous segments; lower lip crenulated 



Lysippe annectcns 



3. With 17 thoracic setigerous segments .... 7 



4. Branchiae partly pinnately divided . Schistocomus hiltoni 



4. Branchiae cirriform or at least not pinnate ... 5 



5. With a pair of large, postbranchial spines 



Melinna heterodonta 



5. Without postbranchial spines 8 



6. Larger; more than 20 mm long when mature; abdomen with 

 13 segments Ampharete arctica 



6. Smaller; less than 8 mm long; with more than 14 abdominal 

 segments ? Ampharete sp. 



7. One of branchial pairs broadly expanded and foliaceous; paleae 

 straight and tapering distally . Amphicteis scaphobranchiata 



7. Branchiae subulate; paleae with thicker, slightly curved stem 

 and long, slender distal mucron . Amphicteis mucronata 



8. Lateral margins of segments 2 to 5 raised as in species of 

 Melinna Melinnexis moorei 



8. Lateral margins of segments not raised .... 9 



9. Branchiae greatly prolonged, extending to end of body (Plate 

 17) ; with 12 thoracic setigerous segments .... 

 Amage longibranchiata 



