CONTENTS. 



VOL. 21. 



LETTER I. 



MPag* 

 ODE in which the Work is intended to be performed... Reasons for employing the Epistolary 



Form 



LETTER II. 



Arrangement of Linnaeus... Of Wallerius...That adopted in the present Work... Zoophytes claim 

 priority of Examination... Corals 4 



LETTER III. 

 Remarks on recent Corals.. .Experiments on, by Mr. Hatchett 8 



LETTER IV. 



Classification. .. Nomenclature. ..Tubiporite... Approaching to Tubipora Musica...Tubipora Strues 

 ...Imbedded in Marble, Mr. Hatchett's Experiments. ..Animal Membrane detected in the 

 Marble formed by this Coral 11 



LETTER V. 



Ramified Tubipore...Silicified Tubipore in Limestone... Marble formed by this Tubipore... Chain 

 Coral... Stellated Tubipore, &c 18 



LETTER VI. 



Madrepore... Mad reporean Polype... Fossil Madrepore. ..Difficulty in ascertaining the Species 

 ...Turbinated Madrepore. ..Varieties of.. .Remarks on its Formation 23 



LETTER VII. 



Observations on turbinated Madrepores continued. ..Porpital, or Shirt Button, Madreporite 

 ...Synonima.. .Madrepores not found in a mineralized State , 30 



LETTER VIII. 



Other Madrepores, not perhaps known in a fossil state... Mad repora Favosa...Madrepora Re- 

 tepora...M. Ananas, &C...M. Foliosa, &c...Astroites...Lithostrotion of Lhwydd...Spider- 

 tone of Bruckman 37 



?v" 



