74 $. III. DIST. CHAR. Form. 



External form of the original. 



To these are to be added all the terms bj 

 which form and structure are distinguished in 

 the original, (v. Prototype.) 

 * * Accidental Form. 



a. Mineral, 



depends on the structure of the mineral 

 substitute, to which the terms, distinctive of 

 such form, ought only to be applied.f (vide 

 Substance. ) 



b. Modal. 



44. Complanated (complanatum)\\ flattened or 

 compressed reduced to a level or even surface 

 during its fossil state or change. 



t Thus we cannot, with propriety, or without a coufusion of 

 terms,say a granular reliquium,*. conchoidalreliquium,&cc.to distin- 

 guish the mineral form, as the same epithets may be used, in certain 

 cases, to discriminate the fossil, according to the essential structure. 



ft Compressed is the epithet usually applied to reliquia in this 

 state; but, as the same word is employed, both in Botany and Zoo- 

 logy, to distinguish the form in all bodies, or their parts, with two 

 opposite flat sides, it has been thought expedient, in the present in- 

 stance, to adopt another term. By this means, a discrimination is 

 established between the animal or vegetable fossils, that have re- 

 ceived the compressed form from their originals, and those which 

 have acquired it, during the process of their mineralization. 



Complanated or flattened reliquia are very common but are 

 always confined to strata with a slaty structure, (v. note ff. p. 6.) 

 It is observable, that the complanation or flattening of the ex- 

 traneous fossil is constantly in a degree proportionate to the thinness 



