NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 103 



6. Composite setae with weakly developed accessory tooth (pi. 7, 

 fig. 149) ; branchiae first present from fourth setiger, already 

 with 5 filaments, increasing to about 13 filaments where best 

 developed E. tridentata,^. 114 



6. Composite setae with well-developed accessory tooth ; branchiae 

 otherwise 7 



7. Dorsum mottled with brown, with or without a pale ring; 

 prostomial antennae more than twice as long as prostomium, 

 neatly to more or less irregularly articulate; similar articula- 

 tions on peristomial and dorsal cirri; branchiae present from 

 setigers 3 to 7 (earlier in younger individuals), continued near- 

 ly to end ; branchial filaments sometimes bifurcated .... 

 E. multipectinata, p. 112 



7. Dorsum with fine, pale punctations (sometimes more conspicu- 

 ous in median and posterior portions), with or without a pale 

 ring; prostomial antennae short, hardly exceed prostomial 

 length or somewhat longer, usually smooth; branchiae present 

 from setigers 6 to 9, with to 10 filaments where best developed 

 E. mutilata, p. 113 



7. Dorsum usually solid reddish brown, with or without pale 

 ring; tips of antennae and cirri sometimes pale or yellow; pro- 

 stomial antennae smooth or somewhat wrinkled but not articu- 

 late, usually not exceeding twice the prostomial length ; bran- 

 chiae first present from setigers 6 to 8, attaining many (20 to 40 

 or more) filaments where best developed, neatly arranged on 

 the side of a heavy branchial stem . . . E. aphroditois, p. 109 



8. Prostomial antennae smooth, long ; some parapodia usually with 

 3 or 4 subacicular hooks ; branchiae first present from setiger 3, 

 as many as 20 or 30 filaments where best developed, ceasing 

 more or less abruptly at about setiger 32; appendage of com- 

 posite hooks with straight distal tooth and a minute secondary 

 tooth E. americana, p. 1 1 8 



8. Prostomial antennae more or less articulate or moniliform; 

 parapodia with one or 2 subacicular hooks; branchiae other- 

 wise ; appendage of composite hooks not so 9 



9. Prostomial antennae with elongate, cylindrical articles; bran- 

 chiae first present from setiger 3, with few (4 or 5) to many 

 (to 15) filaments where best developed, depending on size, ceas- 

 ing at about setiger 36, absent from a long posterior end . . 

 E. vittata, p. 118 



