NO. 1 



HARTMAN : POLYCHAETOUS ANNELIDS 



97 



a. Branchiae present through a considerable region .... 



subgenus Eunice, p. 98 



a. Branchiae absent or nearly so. Subgenus Nicidion, p. 122 

 4. With branchiae 5 



4. Without branchiae 6 



5. Prostomium anteriorly bidentate or rounded Marphysa, p. 126 



5. Prostomium anteriorly rounded . . . Macduffla Mcintosh 



6. Prostomium anteriorly bidentate . . Paramarphysa, p. 129 

 6. Prostomium anteriorly rounded . . Heteromarphysa Verrill 



The Eunicidae, as herein restricted, are clearly separable into 2 major 

 groups, based on 2 striking characters : ( 1 ) the presence or absence of 

 pectinate setae and subacicular hooks and (2) gross structures of pro- 

 boscidial parts. Palola Gray is distinct from all others in that pectinate 

 setae and subacicular hooks are totally lacking; also, the mandible is 

 greatly enlarged, forming a trough in which the maxillary parts are held. 

 Although the species of this group have often been included in the genus 

 Eunice, these differences are herein considered to be of sufficient magni- 

 tude to merit their separation. The remaining genera, provided with 

 pectinate setae and subacicular hooks, are again separable into 2 groups : 



Chart Showing Possible Affinities in the Family Eunicidae 



Number of 

 prostomial 

 antennae 



Five 



Th 



ree 



One 



With pectinate setae and subacicular hooks 



Branchiate 



Tentacular 



cirri 



present 



Tentacular 



cirri 



absent 



. Eunice 



I 



Marphysa 

 (Macduffia) 



Abranchiate 



Nicidion 



Paramarphysa 

 (Heteromarphysa) 



Lysidice 



Ne?natonereis 



Palola 



Without pectinate setae 

 and subacicular hooks 



Branchiate to 

 Abranchiate 



Ancestral form. 



