COlfTENTS. 



PART II. 



SYNOPSIS OF THE GENEEA. 



CHAPTER I. 



PAGE 



Class I. Cephalopoda. Order I. Dibranghiata 155 



Section A. Ogtopoda 158 



Earn, I. ArgonautidcB. — Argonauta = 161 



Fam. II. Octoj^odidce. — Octopus, Pinnoctopus, Eledone, Cir- 

 roteutHs, Pidlonexis, Scseurgus, Bolitsena 163 



Section B. Degapoda 166 



Earn. III. Teuthidcs. — Loligo, Gonatus, SepioteutMs, 

 Beloteuthis, G-eoteuthis, Leptoteuthis, Cranchia, Sepiola, 

 Loligopsis, ClieiroteiitliiSj Histioteutliis, Onyclioteutliis, 

 EnoploteuthiSj Ommastreplies, ThysanoteutHs, Loliolus, 

 Plesioteuthis, Dosidicus 167 



Earn. IV. Belemnitidce. — Belerrmites, Belemnitella, Xiph.o- 

 teiitliiSj Acantlioteutliis, Belenmoteuthis, Conoteutliis .... 173 



Earn. Y. Sepiadce. — Sepia, Spiiailirostra, Beloptera, Belem- 

 nosis, HeHcerus 176 



Earn. YI. Sjnndidce. — Spirtila 17? 



Order II. Tetrabranghiata 178 



Earn. I. Nautilidce. — Nautilus, Lituites, Troclioceras, Cly- 

 menia 185 



Earn. II. OrtlioceratidcB.- — Orttoceras, Gomplioceras, Onco- 

 ceras, Pirragmoceras, Cyrtoceras, Gr}n:oceras, Tlioracoceras, 

 IsTothoceras 190 



Earn. III. Ammo7iitidcB. — Goniatites, Phatdoceras, Bactrites, 

 Ceratites, Ammonites, Crioceras, Toxoceras, Ancyloceras, 

 Scaphites, Helicoceras, Turrilites, Hamites, Ptychoceras, 

 Baculites 195 



CHAPTER II. 



Class II. Gasteropoda , 202 



Order I. Prosobranghiata 209 



Section A. Siphonostomata 209 



Eam. I. Stromlidcc. — Strombus, Pteroceras, RosteUaria, 

 Seraplis 210 



