232 RELICS OF PRIMEVAL LIFE 



though usually filled with serpentine and other 

 hydrous silicates, were sometimes occupied with 

 calcite, pyroxene, or dolomite, showing that they 

 must when recent have been empty canals and 

 tubes. 



4. The mode of filling thus suggested for the 

 chambers and tubes of Eozoon is precisely that 

 which takes place in modern Foraminifera filled 

 with glauconite, and in Palaeozoic crinoids and 

 corals filled with other hydrous silicates, all more 

 or less chemically allied to serpentine. 



5. The type of growth and structure predicated 

 of Eozoon from the observed appearances, in its 

 great size, its laminated and acervuline forms, and 

 in its canal system and tubulation, are not only in 

 conformity with those of other Foraminifera, but 

 such as might be expected in a very ancient form 

 of that group. 



6. Indications exist of other organic bodies in 

 the limestones containing Eozoon, and also of the 

 Eozoon being preserved not only in reefs but in 

 drifted fragmental beds as in the case of modern 

 corals. 



7. Similar organic structures have been found in 

 the Laurentian limestones of Massachusetts, New 



