. V. ARRANGEMENT. 195 



Bivalves and Multivalves - the disunited 

 valves In all, nuclei not referrible to established 

 species. 



- ERISMATOLITHUS 



In cellular fulciraents such as do not shew the 

 structure of their cells. 



solid imperfect specimens not reducible to 

 known species. 



- PHYTOLITHUS the detached stem 

 leaf fruit root, &c. 



Temporary species under each genus are to be 

 arranged according to the part which they repre- 

 sent. e. g. 



MAMMODOLITHUS. 

 ** Species temporales. 



f Forma ossium capitis. 

 j-j- - corporis. 

 artuum. 



&c. &c. 



T mporary species must not be unnecessarily mul- 

 tiplied When two or more detached parts, hitherto 

 considered as distinct temporary species, are ascer- 

 tained to belong to one species of plant or animal,, 

 they must, in future, be arranged as one species, 

 under the part, which in the original is nearest to 

 that fixed on for the foundation of permanent 

 species f. 



t For example the detached stem and fruit of one species of 

 plant have been considered as two distinct temporary specks 



