INDEX. 



147 



Naked throat . . 

 Narcomedusae . . 

 Nature of budding 

 Nematophore . . 

 Nematophores .. 

 Nephridia (?) . . 

 Nerves 



Nerves and Muscles 

 Nervous system 

 Nucleus 

 Nucula nucleus . . 



Obelia 



Obelia dichotoma 



Obelia gelatinosa 



Obelia geniculata 



Obelia longissima 



Object of circulation 



Ocellus 



Odontophore 



(Esophagus 



Oospheres 



Opercularella lacerata 



Operculum 



Ophiodes 



Optic nerve 



Oral tentacles . . 



Order of reproduction 



Organs for seeing 



Ostrea 



Ova set free 



Ovaries in body-wall 



Ovaries in Medusa 



Ovicells 



Ovum 



Oyster 



Pallial bay 

 Pallial line 

 Palps.. 

 Parenchyma 

 Parietal muscles 

 Parkeria 

 Part I. 

 Part II. 

 Part III. 

 Part IV. 

 PartV. 



