xvill CONTENTS. 



CHAPTER XLII. 



General characters of the Tetrabranchiata — Divisions of the Tetra- 

 branchiata — Characters of the Nautiloidea — Orthoceratidas — 

 Endoceratidae — Actinoceratidae — Gomphoceratidae — Ascocera- 

 tidae — Poterioceratidae — Cyrtoceratidae — Lituitidae — Trocho- 

 ceratidas — Nautilidse — Bactritidae — Prosiphonate Nautiloids, 826-847 



CHAPTER XLIII. 



General characters of the Ammonoidea — Structure of the shell in 

 the Ammonoidea — The Aptychus — Zoological affinities of the 

 Ammonoidea — Distribution of the Ammonoidea in time — Clym- 

 eniidas - — Goniatitidae — Arcestidae — Tropitidae — Ceratitidae — 

 Cladiscitidae — Pinacoceratidae — Phylloceratidae — Lytoceratidae 

 — Pty chitidae — Amaltheidae — ^Egoceratidse — H arpoceratidae — 

 Haploceratidae — Stephanoceratidae, 848-870 



CHAPTER XLIV. 



General characters of the Dibranchiate Cephalopods — Skeleton of 

 the Dibranchiates — Classification — Distribution in time — Gen- 

 eral characters of the Decapoda — Phragmophora — Spirulidae — 

 Belemnitidae — Belemnoteuthidae — Sepiophora — Chondrophora 

 — Characters and distribution in time of the Octopoda — Litera- 

 ture of Mollusca, 871-885 



CORRIGENDA TO PART II. 



Page 397 and page 398, for " Phanerogonia" and " Cryfitogonia" read 

 " Phane?-ozonia " and " Cryptozoiiia." 

 i! 451, line 23 from top, for " Sporadiporous " read " Sporadipodous." 



