236 THE DAWN OF LIFE. 



Var. MINOR. — Supplemental skeleton wanting, except near 

 the base, and with very fine canals. Laminse of sarcode much 

 mammillated, thin, and separated by very thin walls. Probably 

 a depauperated variety. 



Var. ACERVULINA.— In oval or rounded masses, wholly acer- 

 vuline. Cells rounded ; intermediate skeleton absent or much 

 reduced ; cell-walls tubulated. This may be a distinct species, 

 but it closely resembles the acervuline parts of the ordinary 

 form. 



EozooN Bavarictjm, Gilmhel. 

 Composed of small acervuline chambers, separated by con- 

 torted walls, and associated with broad plate-like chambers 

 below. Large canals in the thicker parts of the intermediate 

 skeleton. Differs from E. Canadense in its smaller and more 

 contorted chambers. Age probably Haronian. 



Genus AECH^OSPHERmA. 

 A provisional genus, to include rounded solitary chambers, 

 or globigerine assemblages of such chambers, with the cell-wall 

 surrounding them tubulated as in Eozoon. They may be 

 distinct organisms, or gemmae or detached fragments of 

 Eozoon. Some of them much resemble the bodies figured by 

 Dr. Carpenter, as gemmas or ova and primitive chambers of 

 Orbitolites. They are very abundant on some of the strata 

 surfaces of the limestone at Cote St. Pierre. Age Lower 

 Laurentian. 



