C N 





VOLUMJ.. 



LETTER I. 



O TAR- FISH... rarely mineralised. ..Fossil Species particularised 



Pate 



1 



LETTER II. 



Echinites... Arrangement of Leske adopted... The various Species of these Fes.'!!? t 1f > . ; '..?d... 

 Anocysti, divided into Cidares and Clypei , g 



LETTER III. 



Catocysti, divided into Fibulae, Cassides, Scuta, and Placentae. ..Fibula, subdivided into Conuli 

 a id Discoides... Cassis, subdivided intoGalese and Galeolae, included in Echinocorys... Scutum, 

 Echinanthus.. . Placenta, Echinodiscus...Echinocyaraus \% 



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,.t . 

 Crepidula...Concholepas...Calyptraea...Conus...Cypraea...Ovula....TerebeIlum....Oliva.,.An- 

 cilla...Voluta...Mitrft...Columbella...Marginella...Cancellaria...Nassa...Purpura.,.Buccinum 

 ...Eburna...Terebra...Dolium...Harpa.. .Cassis. ..Strombus...Pterocera....Rostellaria....Murex 

 .,.Fuss,..Pyrula...Fasciolaria..,Pleurotoma , ,. .t,. ...... 47 





