CONTENTS. 



xvii 



Page 



Stoastoma - - - - - -197 



Helicina „-_-.- 197 



Acme - - - - - -198 



Geomelania - - - - - -198 



Truncatella - - - - - -198 



Menestho - - - - - 199 



Family VIII. — Ampullar iacea - - - - 199 



Ampullaria. - - - - - - 199 



Order VII. — Nudibranchia - 201 



Family I. — Doridiacea - - - - -201 



FA3IILY II. — Tritoniacea - - - - - 201 



Family III. — AEolidiacea - - - - - 201 



Family IV. — Placobranchiacea - 202 



Family V. — Phyllidiacea ----- 202 



Order VIII. — Heteropoda - 202 



Family I. — Nucleobranchiata ----- 203 



Carinaria - - - - - - 203 



Cardiopoda ------ 204 



Ceratophora - - - - - -204 



Pterotrachea - - - - - - 204 



Family II. — Atlantacea - 204 



Atlanta - - - - - 205 



Oxygyrus ------ 205 



Bellerophon - - - - - - 205 



Bucania ------ 206 



Porcellia ------ 206 



Family III. — Phyllirrhoacea ----- 206 

 Phyllirrhoe - - - - - - 206 



Family IV.—Sayittacea ----- 206 



CLASS III.— PTEROPODA - - - - - 207 



Order I. — Thecosomata - - - - - 209 



Family I. — Cavoliniacea ----- 209 



Cavolinia - - - - - - 209 



Clio 209 



Balantium - - - - - - 210 



a 



