CONTENTS. 
VOLUME III. 
LETTER I . Page 
Stab-fish. .. rarely mineralized.. .Fossil Species particularized, . . . . . . . . . . - . 1 
LETTER II. 
Echinites... Arrangement of Leske adopted... The -various Species of these Fossils described... Anocysti, 
divided into Cidares and Clypei, . . . . . . . . . . • . • . • ■ - - 8 
LETTER III. 
Catocysti, divided into Fibula;, Cassides, Scuta, and Placentae.. .Fibula, subdivided into Conuli and 
Discoides... Cassis, subdivided into Galeae and Galeolae, included in Echinocorys... Scutum, Echi- 
nanthus... Placenta, Echinodiscus-.Echinocyamus, . . . . . • • • • . • • . . 19 
LETTER IV. 
Pleurocysti, Echinarachnius. .Cor Marinum, Spatangus, and its Species, .. .. .. ..28 
LETTER V. 
Spines of Echini.. .Arrangement of Fossil Spines, .. .. .. .. .. .. .. ..37 
LETTER VI. 
Fossil Shells.. .Arrangement of Lamarck adopted. ..Chiton... Patella.. .Fissurella...Emarginula...Cre- 
pidula.-.Concholepas... Cal yptraea... Conus... Cypraea...Ovula...Terebellum... Oliva... Ancilla.-.Voluta 
...Mitra...Columbella... Marginella...Cancellaria...Nassa... Purpura... Buccinum...Eburna...Terebra 
...Dolium,..Harpa... Cassis... Strombus...Pterocera...Rostellaria...Murex...Fusus...Pyrula...Fascio- 
laria...Pleurotoma, .. .. .. .. .. .. .. .. .. .. ..47 
