NO. 3 hartman: polychaetous annelids 329 



Key to Genera 



1. Without oral tentacles Phalacrostemma 



1 . With oral tentacles 2 



2. With 4 paleal-bearing, parathoracic segments; opercular paleae 

 in 2 visible rows Lygdamis 



2. With 3 paleal-bearing, parathoracic segments 3 



3. Opercular paleae greatly reduced, inconspicuous 



Cryptopomatus Gravier 



3. Opercular paleae developed, in 2 or 3 visible rows 4 



4. Opercular paleae in 2 visible rows 5 



4. Opercular paleae in 3 visible rows; without nuchal hooks . . 6 



5. With heavy nuchal hooks dorsally Idanthyrsus 



5, Without heavy nuchal hooks .... Gunnerea Johansson 



6. Middle row of opercular paleae completely conceals inner row 

 and forms a flattened or pointed cone . . . Phragmatopoma 



6. Middle row of opercular paleae not concealing inner row . 

 Sabellaria 



The following species, alphabetically arranged, are discussed below.^ 

 All save 2 {Phalacrostemma setosa, from Hawaii, and hygdamis philip- 

 pinensis, from the Philippines) are from the Western Hemisphere; 5 are 

 described as new. 



1. Idanthyrsus armatus Kinberg 



2. " ornamentatus Chamberlin 



3. " pennatus (Pallas) 



4. Lygdamis asteriformis (Augener) 



5. " nesiotes Chamberlin 



6. " philippinensis (Treadwell) 



7. " teneriis Augener 



8. Phalacrostemma setosa (Treadwell) 



9. Phragmatopoma attenuata, new species 



10. " californica (Fewkes) 



11. " caudata (Kroyer) Morch 



12. " lapidosa Kinberg 



13. " moerchi Kinberg. 



2 It is a pleasure to acknowledge thanks to the administration of the U.S. 

 National Museum for permission to examine important type materials, to Dr. 

 Waldo L. Schmitt for the use of valuable materials, equipment, and laboratory 

 space; to Dr. Martin W. Johnson of the Scripps Institution of Oceanography at 

 La JoUa, where larval stages were observed ; to the American Association of Uni- 

 versity Women for a grant in partial support; and to the administration of the 

 Allan Hancock Foundation for most significant aid. 



