INDEX. 



ORDER I. PULMONIA (continued). 



Pupa, 35 

 Chondrus, 35 

 Succinea, 35 



Clausilia, 36 



Achatina, 36 



Pulmonea Aquatica. 



Onchidium, 37 

 Planorbis, 37 

 Limnaeus, 38 

 Physa, 38 

 Scarabaeus, 38 

 Auricula, 39 

 Conovulus, 39 



ORDER II. NUDIBRANCHIATA, 39 



Doris, 40 

 Onchidora, 40 

 Plocamoceros, 40 

 Polycera, 40 

 Tritonia, 41 

 Thethys, 41 

 Scyllaea, 41 

 Glaucus, 42 

 Laniogerus, 42 

 Eolidia, 42 

 Cavolina, 42 

 Flabellina, 43 

 Tergipes, 43 

 Busiris, 43 

 Placobranchus, 43 



ORDER III. INFEROBRANCHIATA, 43 



Phyllidia, 44 

 Diphyllidia, 44 



ORDER IV. -TECTIBRANCHIATA, 44 



Pleurobranchus, 44 

 Pleurobranchsea, 45 

 Aplysia, 45 

 Dolabella, 46 

 Notarchus, 46 

 Bursatella, 47 

 Akera, 47 



Bullxa, 47 



Bulk, 48 

 Alccra proper, 48 

 Gastroptcron, 48 

 Gastroplax, 49 



