3(1) Eversible proboscis with few to many paragnaths on both max- 

 illary and oral rings. With prostomial eyes (Fig. 2c) 4 



Eversible proboscis without paragnaths; with or without pa- 

 pillae. With or without prostomial eyes 5 



4(3) Parapodia biramous; well developed. Posterior dorsal noto- 

 podial lobes much enlarged and often foliaceous (Fig. 4a). 

 Proboscis area VI with 7-15 paragnaths; area V with 2-5. 

 Neuropodial falcigers only; with straight blades (Fig. 4b): 



Nereis succinea 

 Parapodia biramous; well developed but without enlarged post- 

 erior notopodial lobe (Fig. 4c). Proboscis area VI with 3-4 

 small paragnaths; area V with none {see Fig. 2c). Neuro- 

 podial falcigers only; similar to those of N. suaainea: 



Nereis limnicola 



Fig. 4. a- Nereis succinea, anterior view posterior parapodium; b- 

 N. succinea, posterior falciger; c- N. limnicola, posterior view 

 posterior parapodium. 



5(3) Parapodia biramous; with number of lobes reduced in posterior 



setigers (Fig. 5a-b) . Proboscis with groups of soft papillae: 



Laeonereis oulveri 

 Parapodia uniramous 6 



