CONTENTS. yii 



LETTER XX. 



PW 



Pear Encrinite of Bradford... Superior extremity, inferior extremity.. .Found also at Pfeffingen 208 



LETTER XXI. 



Nave Encrinite, discovered in Yorkshire, by Mr. Martin Lister. ..In Gloucestershire, by Mr. 

 John Beaumont... Supposed to be the Radix of an Encrinus... Shewn to be the Pelvis, or 

 Skeleton, of the Body part. ..Similar Fossils described... Others from the Isle of Gothland... 

 Encrinite in Mr. Donovan's Collection 217 



LETTER XXII. 



The Tortoise Encrinite,,. The Straight Encrinite.. .The Bottle Encrinite.. .The Clove Encrinite 

 ...Kentucky Asterial Fossil... Uncommon Encrinal Vertebrae.. .Fossil, apparently an oval 

 Encrinite 225 



LETTER XXIII. 

 Pentacrinites... Different Vertebrae noticed ....,......,,,....,,,. 241 



LETTER XXIV. 



Briaraean Pentacrinite... Vertebral Column.,. Vertebral Processes... Two-fold Office. ..Bones form- 

 ing the Pelvis. ..Superior Extremities... Anastomosing Pentacrinite ...,,,.......,,,., 248 



LETTER XXV. 

 Remains of the Gloucestershire, Somersetshire, and Yorkshire Pentacrinites , 257 



LETTER XXVI. 

 Opinions and Discoveries respecting the living Analogues of the Pentacrinites 263 



LETTER XXVII. 

 Attempt to ascertain the Number of Species of these Animals ............,....,........,. 272 



LETTER XXVIII. 

 General Remarks on the Fossils already described 278 



LETTER XXIX. 

 Observations on the Process of Petrifaction .....,..,.,..,,.,,...,,.,.,.,.,. ... 28S 



