ZOOLOGY. 247 



21. herncca. Anns two or three oa each side^ round, slen- 

 der ; caudal ovaries two. 



52. Scylloea. Arms six, in pairs, distant. 



****** Mouth before ; body provided with peduncles or 



feet. 



23. Aphrodita. Body oval, furnished with eyes; feelers 



two, setaceous, annulate. 



24. Amphitrite. Body annulate, issuing from a tube ; ten- 

 tacula feathered ; eyes wanting. 



25. Spio. Body articulated, proceeding from a tube ; feel- 

 ers twoj long, simple ; eyes two. 



26. Nereis. Body long, creeping, with lateral pencilled 

 peduncles or feet ; feelers simple. 



27. Nais. Body long, creeping ; peduncles or feet furnish- 

 ed with simple bristles ; feelers wanting ; eyes two, or 

 wanting. 



»***««* Mouth situated beneath, generally central. 



28. Physsophora. Body gelatinous, supported by an Air-^ 



bubble. 



29. Medusa. Sea-Nettle. Body gelatinous, smooth; 

 mouth beneath in the middle j tentacula placed below. 



R 4 



