I, 



ZOOLOGY^ 247 



21. Lernosa, Arms two or three on each side, round, slen- 

 der ; caudal ovaries two. 



^2. Scylloea* Arms six, in pairs, distant. 



■^***** Mouth before y body provided with peduncles or 



feet, 



^3. Aphrodita. Body oval, furnished with eyes ; feelers 

 two, setaceous, annulate. 



24. Amphitrite. Body annulate, issuing from a tube / ieu" 

 tacula feathered ; eyes wanting. 



25. Spio. Body articulated, proceeding from a tube ; feeU 

 ers two, long, simple ; eyes two. 



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

 peduncles or feet ; feelers simple. 



27. JVaz*. 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 ; tentacula placed below. 



R 4 



