1865.] 



Geology and Palaeontology. 



303 



Figs. 1-3. Illustrating the Structure of Eozoon Canadense.* 

 Flo. 1. 



Fig. 3. 



Fig. 2. 



1 ' N.-*^N^^>S»^ - / <I, ''«» 



Fig. 1. Portion of a specimen of Eozoon Canadense from Burgess. Natural size. The white 

 layers are dolomite ; the black layers are dark-green loganite. 



Flo. 2. Diagram explanatory of the structure of Eozoon Canadense. 



A 1 , A 1 , A 1 . Three chambers of one layer, communicating with each other directly at a, and by 

 three passages through a shelly partition at 6. 



A-, A 2 , A 2 . Three chambers of a more superficial layer. 



B, B, B. Proper wall of the chambers, composed of finely tubular shell-substance. 



C, C, C. Intermediate or supplemental skeleton, traversed by D, D,a stolon of communication 

 between two chambers of different layers, and by E, canal-system originating in the lacunar 

 space F. 



Fio. 3. Section of the disc and radiating outgrowths (G) of Calcarina. The remaining letters 

 occurring in this Figure have the same signification as in Fig. 2. 



These structural features are found only in Foraminifera, and if we 

 consider the Eozoon to belong to that class of animals, their interpre- 

 tation becomes easy. The body of Foraminifera consists of the 

 protoplasmic substance termed " sarcode ;" it is soft, almost homo- 

 geneous, and remarkably plastic : it fills the chambers, is thrust 

 through the innumerable canals in the " proper wall " of the chambers 

 in the form of pseudopodia, and is present in all the cavities of the 

 shell of the animal. The sarcode in the " stolons " and in the canal- 

 system of the " supplemental skeleton " thus connects the sarcode of 



* Figs. 1 and 2 have been copied from the ' Quarterly Journal of the Geo- 

 logical Society,' No. 81 ; Fig. 3 has been adapted from pi. xiv., fig. 4, of Carpen-. 

 ter's ' Introduction to the Study of the Foraminifera.' 



